A **minor**: one new template and one new package in the `ci` image. No
existing input changes.

- **`github-release`** publishes each GitLab release to the repo's GitHub
  push mirror on tag pipelines. It mints a one-hour, one-repo token from
  the dunn-releases App, which needs the protected group variables
  `GITHUB_RELEASE_APP_ID` and `GITHUB_RELEASE_APP_KEY_B64`. Notes come from
  the GitLab release, and asset links point back to GitLab. A re-run is
  idempotent and backfills older releases GitHub is missing. Input:
  `github_repo` (owner must be `andrewdunndev`), plus `dry_run` and
  `poll_timeout`.

- **`ci` ships `openssl`**, which the `github-release` job uses to sign its
  token request.