ci: add workflow for PRs to main

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: ci
+on:
+  pull_request:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js 18.x
+        uses: actions/setup-node@v3
+        with:
+          node-version: '18.x'
+      - uses: actions/cache@v3
+        id: cache
+        with:
+          path: |
+            node_modules
+            */**/node_modules
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+      - name: Install dependencies
+        run: yarn install --immutable --immutable-cache
+      - name: Run ci checks
+        run: yarn ci-check
+      - name: Build project
+        run: yarn build
+    #   - name: Run tests
+    #     run: yarn test