chore(gh-actions): add style-lint on CI

.github/workflows/style-lint.yml

@@ -0,0 +1,22 @@
+name: 'Style Lint'
+
+on:
+  push:
+    paths:
+      - '_sass/**.scss'
+  pull_request:
+    paths:
+      - '_sass/**.scss'
+
+jobs:
+  stylelint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup Node
+        uses: actions/setup-node@v3
+      - run: npm i
+      - run: npm test