Add prettier check as a github workflow

.github/workflows/prettier.yml

@@ -0,0 +1,26 @@
+name: Prettier Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  prettier:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "lts/*"
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Check formatting
+        run: npx prettier --check .