feat: use pre-built Docker image from GHCR

.github/workflows/release.yml

@@ -0,0 +1,41 @@
+name: Build and Publish Action Image
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=semver,pattern=v{{major}}
+            type=semver,pattern=v{{major}}.{{minor}}
+            type=semver,pattern=v{{version}}
+            type=sha
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

action.yaml

@@ -8,7 +8,7 @@ branding:
 
 runs:
   using: 'docker'
-  image: 'Dockerfile'
+  image: 'docker://ghcr.io/mittwald/deploy-container-action:v1'
 
 inputs:
   api_token: