Releases are automated on a cron trigger. The new version is determined automatically from the commit history, assuming the commit messages follow conventions, using https://github.com/marketplace/actions/conventional-commits-versioner-action. If you do nothing, eventually the newest commits will be released automatically as a patch or minor release. This automation is defined in .github/workflows/tag.yaml.
Rather than wait for the cron event, you can trigger manually. Navigate to https://github.com/mvukov/rules_ros/actions/workflows/tag.yaml and press the "Run workflow" button.
If you need control over the next release version, for example when making a release candidate for a new major, then: tag the repo and push the tag, for example
% git fetch
% git tag v1.0.0-rc0 origin/main
% git push origin v1.0.0-rc0Then watch the automation run on GitHub actions which creates the release.