Don't run SonarCloud on PRs from forks.

The secret isn't available to forks.

Author: bgrainger

.github/workflows/sonarcloud.yml

@@ -16,6 +16,7 @@ jobs:
   build:
     name: Scan
     runs-on: windows-latest
+    if: github.repository_owner == 'mysql-net'
     steps:
       - name: Set up JDK 11
         uses: actions/setup-java@v1