A github-actions based test and build pipeline (#1932)

* Start creating a github-actions based test and build pipeline

* use a much better CONTAINER_TAG value

* complete build phase with critical css building and pushing

* fix use of old docker-compose command

* only build and push on master

.github/workflows/ci.yaml

@@ -0,0 +1,72 @@
+name: CI Pipeline
+
+on:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - ready_for_review
+  push:
+    branches:
+      - master
+
+jobs:
+  generate-date:
+    runs-on: ubuntu-latest
+    outputs:
+      date: ${{ steps.date.outputs.date }}
+    steps:
+      - name: Get current date
+        id: date
+        run: echo "date=$(date --utc +%Y%m%d.%H%M)" >> $GITHUB_OUTPUT
+
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        test_script: ["phpcs", "phpunit", "behat"]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Bring up test stack
+        run: docker compose -f docker-compose.yml -f docker-compose.ci.yml up -d
+      - name: Debug bring up test stack
+        if: failure()
+        run: docker compose logs
+      - name: Run tests
+        run: docker compose -f docker-compose.yml -f docker-compose.ci.yml run ci ./.ci/${{ matrix.test_script }}
+      - name: Take down test stack
+        if: always()
+        run: docker compose down
+
+  build-and-push:
+    runs-on: ubuntu-latest
+    needs: [generate-date, tests]
+    if: github.ref == 'refs/heads/master'
+    env:
+      CONTAINER_REPO: ghcr.io/elifesciences/journal
+      CONTAINER_TAG: ${{ github.head_ref || github.ref_name }}-${{ github.sha }}-${{ needs.generate-date.outputs.date }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build container image
+        run: |
+          # Build all images
+          docker compose -f docker-compose.yml -f docker-compose.ci.yml build
+
+          # Build critical CSS
+          docker compose -f docker-compose.yml -f docker-compose.ci.yml run --name=journal_critical_css critical_css
+          docker cp journal_critical_css:build/critical-css/. build/critical-css/
+
+          # Rebuild app now we have new CSS
+          docker compose -f docker-compose.yml -f docker-compose.ci.yml build app
+
+          # Retag and push
+          docker image tag elifesciences/journal:develop ${CONTAINER_REPO}:${CONTAINER_TAG}
+      - name: Push container image
+        run: docker push ${CONTAINER_REPO}:${CONTAINER_TAG}