add CI workflow for prettier

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: React Hooks for Dune Echo
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: [self-hosted, xlarge]
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: ".nvmrc"
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm install --no-audit --no-fund
+
+      - name: "Test: prettier"
+        run: npm run test:prettier