Additional Checkstyle checks, that could be added as extension to EclipseCS plugin and maven-checkstyle-plugin, Sonar checkstyle plugin, extension for CheckStyle IDEA plugin.
Yes,
Error is on files in other repository
[ERROR] [checkstyle] [ERROR] /home/semaphore/checkstyle/.ci-temp/sevntu.checkstyle/.github/workflows/bump_license_year.yml:1: Filename should be kebab-case. [regexpOnScriptsAndConfigs]
We need to send PR to that repo to rename this file before merging this PR. Or send PR to extend suppression file in that repo, also separate PR.
It sounds like renaming in sevntu repo for GitHub action will be quicker to do.
Resolves https://github.com/checkstyle/checkstyle/pull/12727#issuecomment-1426055064