Add Docker tags for major and minor versions

.github/workflows/build-and-push-docker-image.yml

@@ -9,8 +9,8 @@ on:   # yamllint disable-line rule:truthy
   workflow_dispatch:
     inputs:
       tag:
-        description: Docker image tag
-        required: true
+        description: Docker image tag (optional, defaults to Git ref)
+        required: false
         type: string
 
 jobs:
@@ -21,12 +21,21 @@ jobs:
     - uses: actions/checkout@v4
     - name: Build Docker image
       run: |
-        IMAGE="ghcr.io/$GITHUB_REPOSITORY:${DOCKER_TAG/'/'/'-'}"
+        DOCKER_TAG="${DOCKER_TAG/'/'/'-'}"
+        DOCKER_TAG_MAJOR=$(echo "$DOCKER_TAG" | cut -d '.' -f 1)
+        DOCKER_TAG_MAJOR_MINOR=$(echo "$DOCKER_TAG" | cut -d '.' -f 1-2)
+        IMAGE="ghcr.io/$GITHUB_REPOSITORY:${DOCKER_TAG}"
+        IMAGE_MAJOR="ghcr.io/$GITHUB_REPOSITORY:${DOCKER_TAG_MAJOR}"
+        IMAGE_MAJOR_MINOR="ghcr.io/$GITHUB_REPOSITORY:${DOCKER_TAG_MAJOR_MINOR}"
         echo "IMAGE=$IMAGE" >>"$GITHUB_ENV"
+        echo "IMAGE_MAJOR=$IMAGE_MAJOR" >>"$GITHUB_ENV"
+        echo "IMAGE_MAJOR_MINOR=$IMAGE_MAJOR_MINOR" >>"$GITHUB_ENV"
         docker build . \
           --build-arg BUILDKIT_INLINE_CACHE=1 \
           --cache-from $IMAGE \
           --tag $IMAGE
+        docker tag $IMAGE $IMAGE_MAJOR
+        docker tag $IMAGE $IMAGE_MAJOR_MINOR
       env:
         DOCKER_TAG: ${{ inputs.tag || github.ref_name }}
     - name: Log in to GHCR
@@ -36,4 +45,7 @@ jobs:
           docker login ghcr.io -u $GITHUB_ACTOR --password-stdin
     - name: Push Docker image to GHCR
       if: github.event_name != 'pull_request'
-      run: docker push $IMAGE
+      run: |
+        docker push $IMAGE
+        docker push $IMAGE_MAJOR
+        docker push $IMAGE_MAJOR_MINOR