To prevent unwanted surprises with new minor versions of go, lock the
version to minor version using [semver tilde
syntax](https://github.com/npm/node-semver#tilde-ranges-123-12-1). We
were already getting 1.21.0 since yesterday, so use that version now as
minimum.
Inspired by
https://github.com/go-gitea/gitea/pull/24530#issuecomment-1558815301
This PR use a file filter action to do different CI jobs according
changed files types. All types are defined in
`.github/file-filters.yml`. Now there are 4 types, `docs`, `backend`,
`frontend` and `build`. Then if a PR only changed docs files, those CI
jobs which passed the conditions will run, and other types are also like
this.
---------
Co-authored-by: silverwind <me@silverwind.io>
- Remove actions name where command is descriptive enough
- Use kebab-case instead of snake-case for step names
- Use shorter job names because to make PR checks more readable
- Remove duplicate `checks-backend`
---------
Co-authored-by: Yarden Shoham <git@yardenshoham.com>
