GitHub Actions: Bump docker/login-action from 1.10.0 to 1.12.0 (#246)

Bumps [docker/login-action](https://github.com/docker/login-action) from 1.10.0 to 1.12.0.
- [Release notes](https://github.com/docker/login-action/releases)
- [Commits](f054a8b539...42d299face)

---
updated-dependencies:
- dependency-name: docker/login-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/docker-publish.yml

@@ -51,7 +51,7 @@ jobs:
       # https://github.com/docker/login-action
       - name: Log into registry ${{ env.REGISTRY }}
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        uses: docker/login-action@42d299face0c5c43a0487c477f595ac9cf22f1a7
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}