One of the nice things about the project I work on is that things like eslint, stylelint, and the unit tests all work locally inside of Docker, so I can be sure I'm pushing code to the repo that won't be rejected by CI for code hygiene reasons. CI runs all that stuff as a check, but it's really there for the integration and end-to-end tests, and the build and deployment processes. If you can get your project to work that way it's really nice to have.