Update docker/build-push-action digest to 31159d4

Author: renovate[bot]

Diff for: .github/workflows/docker-publish.yml

@@ -72,7 +72,7 @@ jobs:
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image
         id: build-and-push
-        uses: docker/build-push-action@94f8f8c2eec4bc3f1d78c1755580779804cb87b2
+        uses: docker/build-push-action@31159d49c0d4756269a0940a750801a1ea5d7003
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}