add docker build

.github/workflows/docker.yml

@@ -0,0 +1,37 @@
+name: Docker
+
+on:
+  push:
+    branches: [ "main" ]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Docker tag for build results'
+        type: string
+        default: manual
+        required: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read # for checkout
+      id-token: write # for OIDC token, used for Depot
+      packages: write # to upload build to GHCR
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        id: docker
+        uses: docker/build-push-action@v1
+        with:
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ghcr.io/manyfold3d/tracking:edge

.ruby-version

@@ -1 +1 @@
-3.3.0
+3.3.5

Dockerfile

@@ -0,0 +1,11 @@
+FROM ruby:3.3
+
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+COPY . /usr/src/app
+RUN bundle install
+
+EXPOSE 9292
+
+CMD [ "rackup", "-o", "0.0.0.0" ]