Bump docker/build-push-action from 2 to 2.4.0 (#233)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2 to 2.4.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2...v2.4.0)

Signed-off-by: dependabot[bot] <support@github.com>

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

.github/workflows/push.yml

@@ -30,7 +30,7 @@ jobs:
           username: ${{env.REPO_OWNER}}
           password: ${{secrets.CR_PAT}}
       - name: Build and push
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v2.4.0
         with:
           context: .
           file: ./Dockerfile