setup ci & presubmit (#20)

* ci & presubmit

* Update ci.yml

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - run: npm install
+
+      - run: npm run build
+
+      - name: Build simple-host example
+        working-directory: examples/simple-host
+        run: |
+          npm install
+          npm run build
+
+      - name: Build simple-server example
+        working-directory: examples/simple-server
+        run: |
+          npm install
+          npm run build
+
+      - run: npm run prettier