BREAKING CHANGE: The worker `RMQ_CONFIG_FILE` environement variable has
been renamed to `LIBRETIME_CONFIG_FILEPATH`. In addition the systemd
working directory for the worker has changed from `/srv/airtime` to
`/var/lib/libretime/worker`.
* Add shared python format-check target
* Add .format-check to api lint target
* Format api code with makefile format target
* Add .format-check to tools lint target
* Add .format-check to analyzer lint target
* Format analyzer code with makefile format target
* Add .format-check to celery lint target
* Add .format-check to api_client lint target
* Format api_client code with makefile format target
* Add .format-check to playout lint target
* Run CI linting in parallel
* Disable isort in pre-commit