upgrade CI to node 18 LTS

Author: keithamus

.github/workflows/nodejs.yml

@@ -1,9 +1,13 @@
 name: Node CI
 
 on:
+  push:
+    branches:
+      - main
   pull_request:
     branches:
-    - main
+      - main
+
 jobs:
   build:
     runs-on: ${{ matrix.os }}
@@ -14,15 +18,15 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:
-    - uses: actions/checkout@v1
-    - name: Use Node.js 16.x
-      uses: actions/setup-node@v1
-      with:
-        node-version: 16.x
-    - name: npm install, build, and test
-      run: |
-        npm install
-        npm run build --if-present
-        npm test
-      env:
-        CI: true
+      - uses: actions/checkout@v1
+      - name: Use Node.js 18.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: 18.x
+      - name: npm install, build, and test
+        run: |
+          npm install
+          npm run build --if-present
+          npm test
+        env:
+          CI: true