Merge pull request #3753 from josephevans/add-ci

Add CI workflows to test with Node 18.x and 20.x.

.github/workflows/build.yml

@@ -0,0 +1,18 @@
+name: Node.js CI Build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: ['18.x', '20.x']
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+      - run: cp src/js/config-template.js src/js/config.js
+      - run: npm ci
+      - run: npm run build --if-present
+      - run: npm test