Lint workflow

.github/workflows/lint.yml

@@ -0,0 +1,31 @@
+name: CI
+on: [push, pull_request]
+
+# Run linter with github actions for quick feedbacks.
+# Run macos tests with github actions.
+jobs:
+  linter:
+    runs-on: ubuntu-latest
+    # run on PRs, or commits to facebookresearch (not internal)
+    if: ${{ github.repository_owner == 'facebookresearch' || github.event_name == 'pull_request' }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.11
+      - name: Install dependencies
+        # flake8-bugbear flake8-comprehensions are useful but not available internally
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install flake8==6.0.0 isort==5.12.0
+          python -m pip install black==23.3.0
+          flake8 --version
+      - name: Lint
+        run: |
+          echo "Running isort"
+          isort -c -sp .
+          echo "Running black"
+          black -l 100 --check .
+          echo "Running flake8"
+          flake8 .