build(deps): Upgrade docker/build-push-action digest to 7a786bb

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -57,7 +57,7 @@ jobs:
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image
-        uses: docker/build-push-action@fdf7f43ecf7c1a5c7afe936410233728a8c2d9c2
+        uses: docker/build-push-action@7a786bb2b9408f7f997564f677248fabd4b886d5
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}