chore: Run 'build' workflow on 'pull_request', since it’s a required check

.github/workflows/nodejs.yml

@@ -1,16 +1,46 @@
 name: Build
-on: [push]
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
 jobs:
   build:
+    name: Build
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js
-      uses: actions/setup-node@v1
-      with:
-        node-version: '14.x'
-    - run: npm install
-    - run: npm run build
-    - run: npm test
-      env:
-        CI: true
+      - name: Get sources
+        uses: actions/checkout@v1
+
+      - name: Restore npm cache
+        uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      - uses: actions/cache@v2
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-node-modules-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-modules-
+
+      - name: Use Node.js 14
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Build
+        run: npm run build
+
+      - name: Test
+        run: npm run test
+        env:
+          CI: true