Workflow zum Erzeugen und Veröffentlichen eines Container Image auf ghcr.io (#327)

* Add workflow

* Update image name in Makefile

* Add step to create VERSION file

* Remove debugging trigger

.github/workflows/release.yaml

@@ -0,0 +1,48 @@
+name: Publish container image
+
+on:
+  release:
+    types:
+      - published
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  push-to-registry:
+    runs-on: ubuntu-latest
+    
+    name: Push container image to ghcr.io
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+
+      - name: Log in to registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.PACKAGES_WRITE_TOKEN }}
+      
+      - name: Create VERSION file
+        run: make VERSION
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Makefile

@@ -1,4 +1,4 @@
-IMAGE := quay.io/netzbegruenung/green-spider:main
+IMAGE := ghcr.io/netzbegruenung/green-spider:main
 
 DB_ENTITY := spider-results