Add a GitHub Action to run npm test

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+# https://docs.github.com/en/actions/tutorials/build-and-test-code/nodejs
+# https://github.com/actions/setup-node
+
+name: ci
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+jobs:
+  ci:
+    strategy:
+      fail-fast: false
+      matrix:  # Remove 24.x until dependencies are compatible
+        node-version: ['20.x', '22.x', 'lts/*']
+    runs-on: ubuntu-latest
+    steps:
+      - run: sudo apt-get update && sudo apt-get install -y libgl1-mesa-dev libgles2-mesa-dev libglx-dev libx11-dev libxext-dev libxi-dev
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v6
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install canvas gl --unsafe-perm
+      - run: npm ci
+      - run: npm run build --if-present
+      - run: xvfb-run -a npm test