Bump docker/build-push-action from 6.11.0 to 6.12.0 (#119)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.11.0 to 6.12.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6.11.0...v6.12.0)

---
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>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -32,7 +32,7 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - uses: docker/build-push-action@v6.11.0
+      - uses: docker/build-push-action@v6.12.0
         with:
           tags: ghcr.io/kiksworks/${{ matrix.context }}:latest
           context: ${{ matrix.context }}