ci: run the helper tests on Ubuntu, macOS and Windows

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+name: Test
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+      # bash on every runner, so the globs expand the same way on Windows.
+      - name: Run the helper tests
+        shell: bash
+        run: node --test appmap-gold-traces/assets/*.test.mjs appmap-review/assets/*.test.mjs