Add an option to disable System Checks

[Marcin Nowak]

I need to disable whole system checks. I don't need them. Silencing is not a solution, because still prints lots of unwanted messages and slowdowns command`s startup.

You can add condition based on DISABLE_SYSTEM_CHECKS setting in django.core.checks.registry.CheckRegistry.run_checks:

    def run_checks(self, app_configs=None, tags=None, include_deployment_checks=False):
        """ Run all registered checks and return list of Errors and Warnings.
        """
        if getattr(settings, 'DISABLE_SYSTEM_CHECKS', None):
            return []

This should be enough to disable checks, but Django still prints out:

Performing system checks...

System check identified no issues (0 silenced).

I would like to make complete patch / pull requests, if you will accept an idea o disabiling system checks.

[Simon Charette]

What about re-using SILENCED_SYSTEM_CHECKS with an '__all__' value instead?

[Tim Graham]

​django-developers discussion

[Tim Graham]

I'm not yet convinced there is a strong demand for disabling all checks instead of disabling the ones that you don't find useful or give false-positives on your project. Will happily reopen if the mailing list discussion decides otherwise.

[C. Knoll]

Although this feature has been closed several years ago as *wontfix* it seems like it has been fixed anyway. Quoting ​https://docs.djangoproject.com/en/4.1/ref/django-admin/#runserver:

 Changed in Django 4.0:

Support for the --skip-checks option was added.