Build image in CI

.github/workflows/ci.yml

@@ -7,6 +7,11 @@ on:
     branches: [ trunk ]
 
 
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+
 jobs:
   run_unit_tests:
     strategy:
@@ -23,3 +28,30 @@ jobs:
       run: sudo apt install --yes ${{matrix.PYTHON}}
     - name: Run tests
       run: ${{matrix.PYTHON}} scrapscript.py test
+  build_docker_image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+    - uses: actions/checkout@v3
+    - name: Log in to the Container registry
+      uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+    - name: Build and push Docker image
+      uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+      with:
+        context: .
+        push: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+    - name: Try a little hello world
+      run: docker run ${{ steps.meta.outputs.tags }} apply "1 + 2"