Bump docker/build-push-action from 3.0.0 to 3.1.0 (#136)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@e551b19...1cb9d22)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/docker-publish.yml

@@ -25,7 +25,7 @@ jobs:
           images: alfg/nginx-rtmp
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@e551b19e49efd4e98792db7592c17c09b89db8d8
+        uses: docker/build-push-action@1cb9d22b932e4832bb29793b7777ec860fc1cde0
         with:
           context: .
           push: true