add workflow

.github/workflows/validation.yml

@@ -0,0 +1,28 @@
+name: "Validation"
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+env:
+  node-version: 18.x
+
+jobs:
+  eslint:
+    runs-on: ubuntu-latest
+    name: 'ESLint'
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+      - name: Use Node.js ${{ env.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.node-version }}
+          cache: "npm"
+      - name: Install Dependencies
+        run: npm clean-install
+      - name: Validate JS Sources
+        run: npm run validate:js