Bump docker/build-push-action from 1.1.0 to 2.4.0 (#18)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 1.1.0 to 2.4.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Upgrade guide](https://github.com/docker/build-push-action/blob/master/UPGRADE.md)
- [Commits](https://github.com/docker/build-push-action/compare/v1.1.0...v2.4.0)

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

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

.github/workflows/docker.yml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/[email protected]
 
       - name: Build and push Docker images
-        uses: docker/build-push-action@v1.1.0
+        uses: docker/build-push-action@v2.4.0
         with:
           username: zu1k
           password: ${{ secrets.GITHUB_TOKEN }}