ci: adjust docker build to also publish

.github/workflows/continuous-docker.yml

@@ -16,13 +16,38 @@ on:
   workflow_dispatch:
 
 env:
-  CARGO_TERM_COLOR: always
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
 
 jobs:
   docker-build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
     steps:
     - uses: actions/checkout@v3
-    - name: Build Image
-      run: ./docker/kumod/build-docker-image.sh
+
+    - name: Log in to the Container registry
+      uses: docker/login-action@v2.1.0
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@v4.3.0
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v4.0.0
+      with:
+        context: .
+        push: true
+        file: docker/kumod/Dockerfile
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}