chore(ci): push images to ghcr

.github/workflows/ghcr.yml

@@ -0,0 +1,63 @@
+name: Container image
+
+on:
+  release:
+    types: [created]
+
+  # Run build for any PRs - we won't push in those however
+  pull_request:
+    branches:
+      - main
+
+  # Publish `main` as Docker `latest` image.
+  push:
+    branches:
+      - main
+
+env:
+  IMAGE_NAME: caluma-interval
+
+jobs:
+  # Push image to GitHub Packages.
+  # See also https://docs.docker.com/docker-hub/builds/
+  container-registry:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: docker build . --file Dockerfile --tag $IMAGE_NAME --label "runnumber=${GITHUB_RUN_ID}"
+
+      - name: Log in to registry
+        if: github.event_name != 'pull_request'
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Push image
+        if: github.event_name != 'pull_request'
+        run: |
+          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
+          # Change all uppercase to lowercase
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+          # Use Docker `latest` tag convention
+          if [[ "$VERSION" == "main" ]]; then
+            # only push "dev" image from main branch build
+            echo "Pushing $IMAGE_ID:dev"
+            docker tag $IMAGE_NAME $IMAGE_ID:dev
+            docker push $IMAGE_ID:dev
+          else
+            # new version released - push "latest" and version tag
+            echo "Pushing $IMAGE_ID:$VERSION"
+            docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+            docker push $IMAGE_ID:$VERSION
+            echo "Pushing $IMAGE_ID:latest"
+            docker tag $IMAGE_NAME $IMAGE_ID:latest
+            docker push $IMAGE_ID:latest
+          fi