Add testing workflow

Author: zachleat

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: Node Unit Tests
+on:
+  push:
+    branches-ignore:
+      - "gh-pages"
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        node: ["18", "20", "22"]
+    name: Node.js ${{ matrix.node }} on ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+          # cache: npm
+      - run: npm install
+      - run: npm test
+env:
+  YARN_GPG: no