update github actions

Author: minjikarin

.github/workflows/build.yml

@@ -4,6 +4,7 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+    types: [opened, synchronize, reopened]
 jobs:
   build:
     runs-on: Ubuntu-latest
@@ -25,3 +26,15 @@ jobs:
         run: npm test
       - name: Before deploy
         run: npm run docs
+  sonarcloud:
+    name: SonarCloud
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - name: SonarCloud Scan
+        uses: SonarSource/sonarcloud-github-action@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}