Change GitHub Actions

.github/workflows/ci.yaml

@@ -1,24 +1,33 @@
 name: CI
 on:
+  push:
+    branches: main
+    paths:
+      - "frontend/**"
   pull_request:
     branches:
       - main
-    paths: 
-      - 'frontend/**'
+    paths:
+      - "frontend/**"
 
 jobs:
   test:
     name: Check the source code
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [18.x]
+    env:
+      working-directory: ./frontend
     steps:
       - uses: actions/checkout@v2
-      - name: Move to frontend
-        run: cd frontend
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
       - name: Install packages
         run: npm ci
       - name: Prettier
         run: npm run prettier
       - name: Lint
         run: npm run lint
-
-