python: add black CI rule

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

.github/workflows/black.yaml

@@ -0,0 +1,11 @@
+name: Lint Python
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: psf/black@stable
+