image: Use modern way of publishing the container

.github/workflows/image.yml

@@ -9,22 +9,42 @@ on:
       - "master"
     paths:
       - "Dockerfile"
+      - ".github/workflows/image.yml"
   pull_request:
     paths:
       - "Dockerfile"
+      - ".github/workflows/image.yml"
   workflow_dispatch:
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}/gtk4
 
 jobs:
   docker:
-    runs-on: ubuntu-22.04
+    permissions:
+      contents: read
+      packages: write
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Push to GitHub Packages
-        uses: docker/build-push-action@v5
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
         with:
-          push: ${{ github.event_name != 'pull_request' }}
+          registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-          registry: ghcr.io
-          repository: ${{ github.repository }}/gtk4
+
+      - name: Extract metadata (tags, labels) for Docker
+        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:
+          push: ${{ github.event_name != 'pull_request' }}
+          context: .
           tags: latest
+          labels: ${{ steps.meta.outputs.labels }}