Fix Docker workflow

.github/workflows/maven.yml

@@ -7,6 +7,10 @@ on:
       - 'main'
       - 'feature/**'
 
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -29,3 +33,48 @@ jobs:
       with:
         name: build-artifact
         path: target/cookiebot-*.jar
+
+  docker:
+   runs-on: ubuntu-latest
+   needs: build
+   permissions:
+     contents: read
+     packages: write
+
+   steps:
+     - name: Checkout repository
+       uses: actions/checkout@v3
+
+     - name: Setup Docker buildx
+       uses: docker/[email protected]
+
+     - name: Log into registry ${{ env.REGISTRY }}
+       uses: docker/login-action@v2
+       with:
+         registry: ${{ env.REGISTRY }}
+         username: ${{ github.actor }}
+         password: ${{ secrets.GITHUB_TOKEN }}
+
+     - name: Extract Docker metadata
+       id: meta
+       uses: docker/[email protected]
+       with:
+         github-token: ${{ secrets.GITHUB_TOKEN }}
+         images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+     - name: Download build artifact
+       uses: actions/download-artifact@v3
+       with:
+         name: build-artifact
+         path: /srv/cookiebot/target/
+
+     - name: Build and push Docker image
+       id: build-and-push
+       uses: docker/[email protected]
+       with:
+         context: .
+         platforms: linux/amd64
+         file: Dockerfile
+         push: true
+         tags: ${{ steps.meta.outputs.tags }}
+         labels: ${{ steps.meta.outputs.labels }}