feat: create a lint action

Author: iennae

.github/workflows/lint.yml

@@ -0,0 +1,42 @@
+name: Lint
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+        with:
+          fetch-depth: 0 
+
+      - name: Setup Python
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        with:
+          python-version: '3.10'
+
+      - name: Install nox
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install nox
+
+      - name: Prepare noxfile
+        run: cp noxfile-template.py noxfile.py
+
+      - name: Make script executable
+        run: chmod +x .github/scripts/lint-changed.sh
+
+      - name: Run lint script for changed files
+        run: |
+          .github/scripts/lint-changed.sh \
+            "${{ github.event_name }}" \
+            "${{ github.base_ref || github.ref_name }}" \
+            "${{ github.event.before }}"