Setting up pre-commit CI on GitHub

## Description
Use [pre-commit CI](https://pre-commit.ci/) to run pre-commit jobs on GitHub. 
The pre-commit CI is configured by `.pre-commit-config.yaml` and requires an initial setup via GitHub Apps.

### TODOs
+ [ ] install and configure `pre-commit ci` in Settings/GitHub Apps -> requires organization's maintainer rights
+ [ ] ensure access rights of pre-commit CI to repository