CI: more flake8 checks

This changes the flake8 configuration so that it is roughly equivalent
to the one for the Yoda ruleset.

.github/workflows/main.yml

@@ -31,8 +31,8 @@ jobs:
 
     - name: Lint with flake8
       run: |
-        pip install flake8
-        flake8 yclienttools --select=E999,F63,F7,F82,F831
+        pip install flake8==6.1.0
+        flake8 . --statistics
     
     - name: Run unit tests
       run: |

setup.cfg

@@ -0,0 +1,7 @@
+[flake8]
+ignore=E221,E241,E402,E501,W503,W605,F403,F405
+import-order-style=smarkets
+strictness=short
+docstring_style=sphinx
+max-line-length=127
+exclude=irodsutils