Skip Sonar scan when SONAR_TOKEN is missing

Author: rddwnn

.github/workflows/sonarcloud.yml

@@ -17,7 +17,8 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: SonarSource/sonarqube-scan-action@master
+      - if: ${{ secrets.SONAR_TOKEN != '' }}
+        uses: SonarSource/sonarqube-scan-action@master
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}