Setup github actions

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ 'v3' ]
+  pull_request:
+    branches: [ 'v3' ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Use Node.js 18
+      uses: actions/setup-node@v3
+      with:
+        node-version: 18
+        cache: 'npm'
+    - run: yarn install
+    - run: yarn build
+    - run: yarn test
+    - run: yarn lint