github/workflows: Split ruff into its own action.

This matches the main repo, and conceputually ruff is not strictly doing
"code formatting".

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Author: jimmo

.github/workflows/code_formatting.yml

@@ -7,8 +7,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - run: pip install --user ruff
-    - run: ruff --format=github .
     - uses: actions/setup-python@v4
     - name: Install packages
       run: source tools/ci.sh && ci_code_formatting_setup

.github/workflows/ruff.yml

@@ -0,0 +1,10 @@
+# https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+name: Python code lint with ruff
+on: [push, pull_request]
+jobs:
+  ruff:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - run: pip install --user ruff
+    - run: ruff --format=github .