Use Buildx for container publishing

.gitea/workflows/publish-image.yaml

@@ -15,13 +15,26 @@ jobs:
     steps:
       - name: Check out source
         uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Log in to Gitea container registry
-        env:
-          REGISTRY_USERNAME: ${{ secrets.PACKAGE_REGISTRY_USERNAME }}
-          REGISTRY_PASSWORD: ${{ secrets.PACKAGE_REGISTRY_PASSWORD }}
-        run: echo "$REGISTRY_PASSWORD" | docker login "$REGISTRY" --username "$REGISTRY_USERNAME" --password-stdin
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.PACKAGE_REGISTRY_USERNAME }}
+          password: ${{ secrets.PACKAGE_REGISTRY_PASSWORD }}
+      - name: Extract image metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE }}
+          tags: |
+            type=raw,value=latest
+            type=sha,format=long
       - name: Build and publish image
-        run: |
-          docker build --tag "$IMAGE:$GITEA_SHA" --tag "$IMAGE:latest" .
-          docker push "$IMAGE:$GITEA_SHA"
-          docker push "$IMAGE:latest"
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}