ci: update Docker tagging logic

Author: johanbook

.github/workflows/nodejs.yaml

@@ -21,6 +21,30 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
 
+      - name: Generate tag name
+        id: prep
+        run: |
+          DOCKER_IMAGE=johanbook/file-domain-server
+          VERSION=latest
+          SHORTREF=${GITHUB_SHA::8}
+
+          # If this is git tag, use the tag name as a docker tag
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/v}
+          fi
+          TAGS="${DOCKER_IMAGE}:${VERSION},${DOCKER_IMAGE}:${SHORTREF}"
+
+          # If the VERSION looks like a version number, assume that
+          # this is the most recent version of the image and also
+          # tag it 'latest'.
+          if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+            TAGS="$TAGS,${DOCKER_IMAGE}:latest"
+          fi
+
+          # Set output parameters.
+          echo ::set-output name=tags::${TAGS}
+          echo ::set-output name=docker_image::${DOCKER_IMAGE}
+
       - name: Build Docker images
         uses: docker/build-push-action@v2
         with:
@@ -29,4 +53,4 @@ jobs:
           file: ./Dockerfile
           platforms: linux/amd64,linux/arm/v7,linux/arm64,linux/ppc64le
           push: true
-          tags: johanbook/file-domain-server:${{GITHUB_REF#refs/tags/v}}
+          tags: ${{ steps.prep.outputs.tags }}