fix: use jar instead of unzip in sonarqube workflow

The build container lacks unzip. The JDK jar command handles zip
extraction natively.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/sonarqube.yml

@@ -66,7 +66,7 @@ jobs:
             *)             PLATFORM="linux-x64" ;;
           esac
           curl -sSLo sonar-scanner.zip "https://binaries.sonarsource.com/Distribution/sonar-scanner-cli/sonar-scanner-cli-${SONAR_SCANNER_VERSION}-${PLATFORM}.zip"
-          unzip -q sonar-scanner.zip
+          jar xf sonar-scanner.zip
           ln -s "$(pwd)/sonar-scanner-${SONAR_SCANNER_VERSION}-${PLATFORM}/bin/sonar-scanner" /usr/local/bin/sonar-scanner
 
       - name: SonarQube Analysis