ci: add Jest test workflow for PRs

Co-Authored-By: Michael Latman <[email protected]>

.github/workflows/jest-tests.yml

@@ -0,0 +1,23 @@
+name: Jest Tests
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: '18'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run Jest tests
+        run: npm test