[Task] #9 build action to use container

to enable accessing localhost

.github/workflows/build.yml

@@ -12,19 +12,10 @@ on:
 jobs:
   build-node:
     runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        node-version: [20.x]
-        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
-
+    container: node:20
     steps:
+    - run: node --version
     - uses: actions/checkout@v3
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v3
-      with:
-        node-version: ${{ matrix.node-version }}
-        cache: 'npm'
     - run: npm ci
     - run: npm run build --if-present
-    - run: npm run start
+    - run: npm run start --if-present