Bump docker/build-push-action from 2 to 3 (#263)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2 to 3.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2...v3)

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

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

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -124,7 +124,7 @@ jobs:
           GOPATH: ${{ env.GOPATH }}
           HOMEBREW_TAP_GITHUB_TOKEN: ${{ secrets.NGINX_PAT }}
       - name: Push to Dockerhub
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v3
         with:
           file: build/Dockerfile
           context: '.'