Adjust publishing workflow

.github/workflows/docker-image.yml

@@ -11,6 +11,9 @@ on:
 jobs:
   build_and_push:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -19,7 +22,9 @@ jobs:
         id: meta
         uses: docker/metadata-action@v4
         with:
-          images: ${{ vars.DOCKER_REPOSITORY || 'ghostfolio/ghostfolio' }}
+          images: |
+            ${{ vars.DOCKER_REPOSITORY || 'ghostfolio/ghostfolio' }}
+            ghcr.io/${{ github.repository }}
           tags: |
             type=semver,pattern={{major}}
             type=semver,pattern={{version}}
@@ -38,6 +43,14 @@ jobs:
           username: ${{ secrets.DOCKER_HUB_USERNAME }}
           password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
 
+      - name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Build and push
         uses: docker/build-push-action@v3
         with: