Improve docker image tagging

.github/workflows/docker-image.yml

@@ -1,10 +1,12 @@
 name: Docker image CD
 
 on:
-  workflow_dispatch:
   push:
     tags:
       - '*.*.*'
+    pull_request:
+      branches:
+        - 'master'
 
 jobs:
   build_and_push:
@@ -13,6 +15,16 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
 
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: grobut939/ghostfolio
+          tags: |
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
 
@@ -21,6 +33,7 @@ jobs:
         uses: docker/setup-buildx-action@v2
 
       - name: Login to DockerHub
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
@@ -31,7 +44,8 @@ jobs:
         with:
           context: .
           platforms: linux/amd64,linux/arm64
-          push: true
-          tags: grobut939/ghostfolio:latest
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.output.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max