Linters are automatically shared with all developers for a repository using the .trunk/trunk.yaml file. This file is committed to the repo, so whenever anyone checks out the code, they will get the same configuration and linters. See the Trunk YAML guide for more details.
If you wish to customize a linter for just one developer (say, disable a slow linter on a slow machine), you can create a per-user config in the .trunk/user.yaml file, which should not be committed to the repo.
If you wish to share linters between different repos, copy the config manually or create a shared Plugin repo. This is a set of configuration and code that is imported into the plugins section of a project's ./trunk/trunk.yaml .