ci: Add a workflow to check formatting

Author: hellozee

.github/workflows/black.yml

@@ -0,0 +1,10 @@
+name: Lint
+
+on: push
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: psf/black@stable