Improve our CI tests (#11476)

* add a test and dry-run to qmk generate-api

* add a dry-run to qmk pyformat

* Add a --dry-run to qmk cformat

* reverse the order of nose2 and flake8 tests

* run CI test against cformat and pyformat

* fix programming errors

* tweak job name

* fix argument

* refine the files we select

* fix stack trace in --ci

* make cformat exit clean

* fix c file extensions

* decouple CI from pyformat

* remove --ci arg

* make ci happy

* use the environment var instead

* change output to text

* fix log message

* replace tabs

lib/python/qmk/cli/pyformat.py

@@ -5,13 +5,22 @@ from milc import cli
 import subprocess
 
 
+@cli.argument('-n', '--dry-run', arg_only=True, action='store_true', help="Flag only, don't automatically format.")
 @cli.subcommand("Format python code according to QMK's style.", hidden=False if cli.config.user.developer else True)
 def pyformat(cli):
     """Format python code according to QMK's style.
     """
+    edit = '--diff' if cli.args.dry_run else '--in-place'
+    yapf_cmd = ['yapf', '-vv', '--recursive', edit, 'bin/qmk', 'lib/python']
     try:
-        subprocess.run(['yapf', '-vv', '-ri', 'bin/qmk', 'lib/python'], check=True)
-        cli.log.info('Successfully formatted the python code in `bin/qmk` and `lib/python`.')
+        cli.run(yapf_cmd, check=True, capture_output=False)
+        cli.log.info('Python code in `bin/qmk` and `lib/python` is correctly formatted.')
+        return True
 
     except subprocess.CalledProcessError:
-        cli.log.error('Error formatting python code!')
+        if cli.args.dry_run:
+            cli.log.error('Python code in `bin/qmk` and `lib/python` incorrectly formatted!')
+        else:
+            cli.log.error('Error formatting python code!')
+
+    return False