ci: add flake8 to the linters workflow

Author: fguillot

.github/workflows/linters.yml

@@ -4,7 +4,7 @@ on:
     branches:
       - main
 jobs:
-  ruff-check:
+  linters:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -15,7 +15,9 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install ruff
+          pip install ruff flake8
       # Update output format to enable automatic inline annotations.
       - name: Run Ruff
         run: ruff check --output-format=github .
+      - name: Run Flake8
+        run: flake8 --max-line-length 120