Infrastructure: Add pull request deployment using Helm

.github/workflows/helm_pr_deployment.yml

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+name: Deploy PR to Kubernetes
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  deploy:
+    if: ${{ github.event.pull_request.head.repo.full_name == 'ls1intum/Artemis' }}
+    runs-on: ubuntu-latest
+    environment:
+      name: k8s
+      url: https://pr${{ github.event.pull_request.number }}.artemis-k8s.ase.cit.tum.de
+    concurrency: k8s-pr${{ github.event.pull_request.number }}
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Setup Helm
+        uses: azure/setup-helm@v3
+        with:
+          version: v3.15.0
+
+      - name: Setup Kubectl
+        uses: azure/setup-kubectl@v3
+        with:
+          version: v1.30.1
+
+      - name: Authenticate to Kubernetes cluster
+        run: |
+          mkdir -p $HOME/.kube
+          echo "${{ secrets.KUBECONFIG }}" > "$HOME/.kube/config"
+
+      - name: Get branch name
+        id: branch
+        run: echo "BRANCH_NAME=\"${GITHUB_REF#refs/heads/}\"" >> "$GITHUB_ENV"
+
+      - name: Determine tag
+        id: determine-tag
+        run: echo "SEM_VERSION=0.0.0-pr${{ github.event.pull_request.number }}" >> "$GITHUB_ENV"
+
+      - name: Update chart dependencies
+        run: helm dependency update helm/artemis
+
+      - name: Chart | Push
+        uses: appany/[email protected]
+        with:
+          name: artemis
+          repository: ${{ github.repository_owner }}/helm
+          tag: ${{ env.SEM_VERSION }}
+          path: helm/artemis
+          registry: ghcr.io
+          registry_username: ${{ github.repository_owner }}
+          registry_password: ${{ secrets.GITHUB_TOKEN }}
+          update_dependencies: 'true'
+
+      - name: Deploy Helm chart
+        run: |
+          helm upgrade --install artemis \
+            oci://ghcr.io/${{ github.repository_owner }}/helm/artemis --version ${{ env.SEM_VERSION }} \
+            --namespace artemis-pr${{ github.event.pull_request.number }} --create-namespace \
+            --set artemis.ingress.className="" \
+            --set artemis.ingress.annotations.cert-manager\\.io/cluster-issuer="letsencrypt-prod" \
+            --set artemis.ingress.annotations.spec\\.ingressClassName=nginx \
+            --set-string artemis.ingress.annotations.kubernetes\\.io/tls-acme="true" \
+            --set-string artemis.ingress.annotations.nginx\\.ingress\\.kubernetes\\.io/ssl-redirect="true" \
+            --set artemis.ingress.hosts[0].host=pr${{ github.event.pull_request.number }}.artemis-k8s.ase.cit.tum.de \
+            --set artemis.ingress.hosts[0].paths[0].path="/" \
+            --set artemis.ingress.hosts[0].paths[0].pathType=ImplementationSpecific \
+            --set artemis.ingress.tls[0].secretName=artemis-pr${{ github.event.pull_request.number }}-tls \
+            --set artemis.ingress.tls[0].hosts[0]=pr${{ github.event.pull_request.number }}.artemis-k8s.ase.cit.tum.de \
+            --set application.registry.jwt=${{ secrets.REGISTRY_JWT }} \
+            --set application.versioncontrol.url="https://pr${{ github.event.pull_request.number }}.artemis-k8s.ase.cit.tum.de" \
+            --set application.userManagement.internalAdmin.username=admin \
+            --set application.userManagement.internalAdmin.password=${{ secrets.ADMIN_PW }} \
+            --set artemisVersion=pr-${{ github.event.pull_request.number }} \
+            --wait
+
+      - name: Post Deployment Comment
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const prNumber = context.issue.number;
+
+            github.rest.issues.createComment({
+              ...context.repo,
+              issue_number: prNumber,
+              body: `
+            :rocket: Deployed **PR #${prNumber}** to https://pr${prNumber}.artemis-k8s.ase.cit.tum.de
+
+            :hourglass_flowing_sand: It might take up to **10 minutes** to fully start up.
+              `
+            });

.github/workflows/helm_pr_deployment_delete.yml

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+name: Cleanup PR Deployment from Kubernetes
+
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  destroy:
+    if: ${{ github.event.pull_request.head.repo.full_name == 'ls1intum/Artemis' }}
+    runs-on: ubuntu-latest
+    environment:
+      name: k8s
+      url: https://pr${{ github.event.pull_request.number }}.artemis-k8s.ase.cit.tum.de
+
+    concurrency: k8s-pr${{ github.event.pull_request.number }}
+
+    steps:
+      - name: Setup Helm
+        uses: azure/setup-helm@v3
+        with:
+          version: v3.15.0
+
+      - name: Setup Kubectl
+        uses: azure/setup-kubectl@v3
+        with:
+          version: v1.30.1
+
+      - name: Authenticate to Kubernetes cluster
+        run: |
+          mkdir -p $HOME/.kube
+          echo "${{ secrets.KUBECONFIG }}" > "$HOME/.kube/config"
+
+      - name: Delete Helm release
+        run: |
+          helm uninstall artemis --namespace artemis-pr${{ github.event.pull_request.number }}
+
+      - name: Delete Kubernetes namespace
+        run: |
+          kubectl delete namespace artemis-pr${{ github.event.pull_request.number }}

helm/.gitignore

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+charts

helm/artemis/Chart.lock

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+dependencies:
+- name: prometheus-adapter
+  repository: https://prometheus-community.github.io/helm-charts
+  version: 3.4.1
+- name: prometheus
+  repository: https://prometheus-community.github.io/helm-charts
+  version: 15.18.0
+digest: sha256:9eb272bb161e9a4bf9fff7ec31a7719664ff2dce11e28be0d94a83bded0cffa1
+generated: "2024-08-10T17:33:10.801079972+02:00"

helm/artemis/Chart.yaml

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+apiVersion: v2
+name: artemis
+description: A Helm chart for Artemis 
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+#TODO: figure out how and when this is updated
+version: 1.0.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "7.5.0"
+
+
+sources: 
+  - https://github.com/ls1intum/Artemis
+  - https://github.com/ls1intum/artemis-helm
+
+maintainers: 
+  - name: Matthias Linhuber
+    email: [email protected]
+
+icon: "https://github.com/ls1intum/Artemis/blob/develop/src/main/resources/public/images/logo.png"
+
+dependencies:
+  - name: prometheus-adapter
+    repository: https://prometheus-community.github.io/helm-charts
+    version: 3.4.1
+    condition: artemis.autoscaler.customPrometheus
+  - name: prometheus
+    repository: https://prometheus-community.github.io/helm-charts
+    version: 15.18.0
+    condition: artemis.autoscaler.customPrometheus

helm/artemis/templates/NOTES.txt

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+1. Get the application URL by running these commands:
+{{- if .Values.artemis.ingress.enabled }}
+{{- range $host := .Values.artemis.ingress.hosts }}
+  {{- range .paths }}
+  http{{ if $.Values.artemis.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
+  {{- end }}
+{{- end }}
+{{- else if contains "NodePort" .Values.artemis.service.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "artemis.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.artemis.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "artemis.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "artemis.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
+  echo http://$SERVICE_IP:{{ .Values.artemis.service.port }}
+{{- else if contains "ClusterIP" .Values.artemis.service.type }}
+  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "artemis.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+  export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
+  echo "Visit http://127.0.0.1:8080 to use your application"
+  kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
+{{- end }}

helm/artemis/templates/_helpers.tpl

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+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "artemis.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "artemis.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "artemis.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "artemis.labels" -}}
+helm.sh/chart: {{ include "artemis.chart" . }}
+{{ include "artemis.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "artemis.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "artemis.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "artemis.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "artemis.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}
+
+
+{{/*
+Generate common Artemis java spring profiles
+*/}}
+{{- define "artemis.springprofiles" -}}
+prod,artemis,decoupling
+{{- if .Values.application.userManagement.provider -}}
+,{{ .Values.application.userManagement.provider }}
+{{- end }}
+{{- if .Values.application.userManagement.ldap.enabled -}}
+,ldap
+{{- end }}
+{{- if .Values.application.versioncontrol.provider -}}
+,{{ .Values.application.versioncontrol.provider }}
+{{- end }}
+{{- if .Values.application.continuousintegration.provider -}}
+,{{ .Values.application.continuousintegration.provider }}
+{{- end }}
+{{- end }}

helm/artemis/templates/autoscaler/horizontal-pod-autoscaler.yml

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+{{- if .Values.artemis.autoscaler.enabled }}
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ include "artemis.fullname" . }}
+  labels:
+    {{- include "artemis.labels" . | nindent 4 }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ include "artemis.fullname" . }}
+  minReplicas: {{ .Values.artemis.autoscaler.minReplicas }}
+  maxReplicas: {{ .Values.artemis.autoscaler.maxReplicas }}
+  {{- with .Values.artemis.autoscaler.behavior }}
+  behavior:
+    {{- toYaml . | nindent 8 }}
+  {{- end }}
+  metrics:
+  {{- if .Values.artemis.autoscaler.metrics.usersPerInstance }}
+  - type: Pods
+    pods:
+      metric:
+        name: artemis_instance_websocket_users
+      target:
+        type: AverageValue
+        averageValue: {{ .Values.artemis.autoscaler.metrics.usersPerInstance }}
+  {{- end }}
+  {{- range .Values.artemis.autoscaler.metrics.externalMetrics }}
+  - type: External
+    external:
+      metric:
+        name: {{ .name }}
+        selector:
+          matchLabels:
+            {{- toYaml .labels | nindent 12 }}
+      target:
+        type: AverageValue
+        averageValue: {{ .targetValue }}
+  {{- end }}
+{{- end }}