ci: add basic workflow

.github/workflows/pull-request.yaml

@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  workflow_dispatch: {}
+  pull_request: {}
+  push:
+    branches:
+      - main
+
+# When a new revision is pushed to a PR, cancel all in-progress CI runs for that
+# PR. See https://docs.github.com/en/actions/using-jobs/using-concurrency
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  packages:
+    name: test packages
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        pkg: [opa-react]
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "21.x"
+      - run: corepack enable
+      - name: setup and test
+        run: |
+          yarn
+          yarn test
+        working-directory: packages/${{ matrix.pkg }}