Adds linter as a GitHub action

.github/workflows/lint.yaml

@@ -0,0 +1,40 @@
+name: Lint
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+
+concurrency:
+  group: lint-${{ github.workflow }}-${{ github.ref == 'refs/heads/main' && github.run_number || github.ref }}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash -l -eo pipefail {0}
+
+jobs:
+  lint:
+    if: github.repository_owner == 'meta-pytorch'
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.10']
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v4
+      - name: Setup python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Update pip
+        run: python -m pip install --upgrade pip
+      - name: Install lint utilities
+        run: |
+          python -m pip install pre-commit
+          pre-commit install-hooks
+      - name: Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@d6e91a2266cdb9d62096cebf1e8546899c6aa18f # v45.0.6
+      - name: Lint modified files
+        run: pre-commit run --files ${{ steps.changed-files.outputs.all_changed_files }}