chore(deps): update docker/build-push-action action to v6.15.0

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Build and push Docker image
         id: build-and-push
-        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75 # v6.9.0
+        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c434f0b7a4 # v6.15.0
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}