Create GH action for code formatting

.github/workflows/cla.yml

@@ -26,7 +26,7 @@ jobs:
           path-to-signatures: 'cla-bot/v1/cla.json'
           # branch should not be protected
           branch: 'main'
-          allowlist: user1,bot*
+          allowlist: user1,mlc-automations,bot*
           remote-organization-name: mlcommons
           remote-repository-name: systems
 

.github/workflows/format.yml

@@ -0,0 +1,60 @@
+# Automatic code formatting
+name: "Code formatting"
+on:
+  push:
+    branches:
+      - "**"
+
+env:
+  python_version: "3.9"
+
+jobs:
+  format-code:
+    if: github.actor != 'mlc-automations'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.MLC_AUTOMATIONS_APP_ID }}
+          private-key: ${{ secrets.MLC_AUTOMATIONS_PRIVATE_KEY }}
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          token: ${{ steps.app-token.outputs.token }}
+
+      - name: Set up Python ${{ env.python_version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.python_version }}
+
+      - name: Format modified Python files
+        env:
+          filter: ${{ github.event.before }}
+        run: |
+          python3 -m pip install autopep8
+          for FILE in $(git diff --name-only $filter | grep -E '.*\.py$')
+          do
+            # Check if the file still exists in the working tree
+            if [ -f "$FILE" ]; then
+              autopep8 --in-place -a "$FILE"
+              git add "$FILE"
+            fi
+          done
+
+      - name: Commit and push changes
+        run: |
+          HAS_CHANGES=$(git diff --staged --name-only)
+          if [ ${#HAS_CHANGES} -gt 0 ]; then
+            # Use the GitHub actor's name and email
+            git config --global user.name mlc-automations
+            git config --global user.email "3246381+mlc-automations@users.noreply.github.com"
+            # Commit changes
+            git commit -m '[Automated Commit] Format Codebase'
+            git push 
+          fi