Update docker/build-push-action digest to 31ca4e5

.github/workflows/build-publish.yml

@@ -88,7 +88,7 @@ jobs:
       # https://github.com/docker/build-push-action
       - name: Build and push Docker images
         id: build-and-push
-        uses: docker/build-push-action@7e094594beda23fc8f21fa31049f4b203e51096b
+        uses: docker/build-push-action@31ca4e5d51253d7e4a2317bfe74699cbe3a398a9
         with:
           context: .
           file: ./${{ matrix.variant }}.Dockerfile