add black as lint tool

.github/workflows/lint.yml

@@ -0,0 +1,10 @@
+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: psf/black@stable

legacy/apps.py

@@ -2,5 +2,5 @@ from django.apps import AppConfig
 
 
 class LegacyConfig(AppConfig):
-    default_auto_field = 'django.db.models.BigAutoField'
-    name = 'legacy'
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "legacy"

manage.py

@@ -5,7 +5,7 @@ import sys
 
 
 def main():
-    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'boofilsic.settings')
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "boofilsic.settings")
     try:
         from django.core.management import execute_from_command_line
     except ImportError as exc:
@@ -17,5 +17,5 @@ def main():
     execute_from_command_line(sys.argv)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()