Expand Docker image tagging (#919)

Co-authored-by: Goostaf <gasplund2@gmail.com>

.github/workflows/build-and-publish-image.yml

@@ -1,8 +1,12 @@
 name: Build Docker Image
+
 on:
   push:
+    branches: [main]
     tags:
-      - v[0-9]+.[0-9]+.[0-9]+
+      - v[0-9]+.[0-9]+.[0-9]+*
+  pull_request:
+    branches: [main]
 
 jobs:
   build:
@@ -31,11 +35,25 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/gamma
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+            type=edge
+            type=ref,event=pr  
+
       - name: Build Docker image
         run: ./gradlew bootBuildImage
 
-      - name: Docker Tag and Build
+      - name: Push docker image
         run: |
-          version=${GITHUB_REF#refs/tags/}
-          docker tag app:latest ghcr.io/${{ github.repository_owner }}/gamma:${version}
-          docker push ghcr.io/${{ github.repository_owner }}/gamma:${version}
+          for tag in $(jq -r '.tags | join(" ")' <<< $DOCKER_METADATA_OUTPUT_JSON ); do
+            docker image tag app:latest $tag
+          done
+          docker image push --all-tags ghcr.io/${{ github.repository_owner }}/gamma