ci: add Docker Buildx setup to workflow

Set up Docker Buildx to enable advanced build features and multi-platform image building capabilities in the CI pipeline.

Author: tmeckel

.github/workflows/build-and-deploy.yml

@@ -42,6 +42,9 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Extract metadata (tags, labels)
         id: meta
         uses: docker/metadata-action@v5