Check instead of fix

[garak]

The main use of this action should be to check if some PR breaks your coding standard.
Currently, it instead fixes the code, which is pointless (the fixed code is in the CI container, not your actual code).

The only way to get the intended behaviour is currently to use this configuration:

with:
    args: --dry-run

You should change this line to read like the following:

/usr/local/bin/php-cs-fixer check $*

If you don't want to change it, you should at least give a big warning in the documentation.