Bump docker/build-push-action from 1.1.0 to 2.4.0 (zu1k#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](docker/build-push-action@v1.1.0...v2.4.0)

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

Author: dependabot[bot]

.github/workflows/docker.yml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/checkout@v2.3.2
 
       - 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 }}