chore(ci): add linter for GitHub Actions as pre-commit hook (aws-powertools#1479)

Author: heitorlessa

.github/workflows/python_build.yml

@@ -56,5 +56,6 @@ jobs:
         uses: codecov/codecov-action@81cd2dc8148241f03f5839d295e000b8f761e378 # 3.1.0
         with:
           file: ./coverage.xml
+          # flags: unittests
           env_vars: PYTHON
           name: aws-lambda-powertools-python-codecov