style(): small improvements

src/backend/justfile

@@ -14,35 +14,41 @@ help: default
 run:
     @ uv run python manage.py runserver
 
+[group('style')]
 style:
     just format
     just lint
     just mypy
 
+[group('test')]
 check:
     just style
-    just test
     just test-coverage
 
 # lints codebase using golangci-lint
-[group('lint')]
+[group('style')]
 lint:
     @ uv run ruff check .
 
 # lints and fixes codebase using ruff
-[group('lint')]
+[group('style')]
 fix:
     @ uv run ruff check . --fix
 
 # formats codebase using ruff
-[group('lint')]
+[group('style')]
 format:
     @ uv run ruff format .
 
+# checks correct formatting of the codebase using ruff
+[group('style')]
+format-check:
+    @ uv run ruff format . --check
+
 alias fmt := format
 
 # lints codebase using mypy
-[group('lint')]
+[group('style')]
 mypy:
     @ uv run mypy .