feat(jenkins): add Jenkins CI/CD Platform Cloudron package

- Complete Jenkins package with Java 17 and WAR file download
- Proper CloudronManifest.json with correct metadata
- Custom start.sh script with Jenkins configuration
- Health check endpoint configured for /login
- Follows KNELCloudron- naming convention
- Added comprehensive packaging shortlist with 56 applications prioritized by phase

CloudronPackages/Jenkins/supervisord.conf

@@ -0,0 +1,12 @@
+[supervisord]
+logfile=/var/log/supervisor/supervisord.log
+pidfile=/run/supervisord.pid
+nodaemon=true
+
+[program:app]
+command=/app/pkg/start.sh
+autorestart=true
+stdout_logfile=/var/log/supervisor/app.stdout.log
+stderr_logfile=/var/log/supervisor/app.stderr.log
+user=cloudron
+