Add CI GHA workflow to run tests on PRs

Signed-off-by: Laura Brehm <laurabrehm@hey.com>

Author: laurazard

.github/workflows/ci.yml

@@ -0,0 +1,20 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+      - run: yarn install --frozen-lockfile
+      - run: yarn test