⬆️ Upgrade docker/build-push-action action to v6.15.0 (#90)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/docker.yaml

@@ -39,7 +39,7 @@ jobs:
             type=sha
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6.14.0
+        uses: docker/build-push-action@v6.15.0
         with:
           context: .
           push: true