CI: Add linter

.github/workflows/build.yml

@@ -4,7 +4,7 @@ jobs:
   linux:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Build
         run: |
           docker pull openturns/archlinux-module
@@ -27,7 +27,7 @@ jobs:
   mingw:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Build
         run: |
           docker pull openturns/archlinux-module-mingw

.github/workflows/lint.yml

@@ -0,0 +1,19 @@
+name: Lint source code
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install
+      run: |
+        sudo apt-get install python3-pip
+        pip3 install flake8
+    - name: Run linter 
+      run: ./utils/lint.sh
+

utils/lint.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+# pip install flake8 
+
+PATH=~/.local/bin/:$PATH flake8 python/ --ignore=W503 --max-line-length=120