Add workflow for python code style

Author: Kevinjil

.github/workflows/codestyle.yml

@@ -69,3 +69,13 @@ jobs:
           webapp/public
           webapp/config
 
+  pycodestyle:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Download pycodestyle python file
+        run: >
+          curl -L -o /tmp/pycodestyle.py 'https://github.com/PyCQA/pycodestyle/raw/refs/tags/2.12.1/pycodestyle.py'
+      - name: Check codestyle in python files
+        run: >
+          python3 /tmp/pycodestyle.py --exclude='./example_problems/,./doc/,./gitlab/' --max-line-length 120 --show-pep8 --show-source .