Adds github actions CI workflow

Author: zachleat

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: Node Unit Tests
+on: [push, pull_request]
+permissions: read-all
+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@692973e3d937129bcbf40652eb9f2f61becf3332 # 4.1.7
+      - name: Setup node
+        uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b # 4.0.3
+        with:
+          node-version: ${{ matrix.node }}
+          # cache: npm
+      - run: npm install
+      - run: npm test
+env:
+  YARN_GPG: no