👷 add CI config

Author: marcode24

.github/workflows/linter.yml

@@ -0,0 +1,29 @@
+name: Portfolio Linter
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+    types: [opened, synchronize]
+
+jobs:
+  linter:
+    name: ✅ Validate linter
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: ⬇️ Checkout project
+        uses: actions/checkout@v3
+
+      - name: 🟢 Setup NodeJS 18.x
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18.x
+          cache: npm
+          cache-dependency-path: './package-lock.json'
+
+      - name: 📥 Install dependencies
+        run: npm ci
+
+      - name: 📑 Check lint
+        run: npm run lint