fix: ProxySQL start/stop scripts handle daemonization correctly

- Start script waits for ProxySQL's own PID file instead of tracking
  shell background PID (ProxySQL forks when daemonizing)
- Stop script uses pkill -f to kill child processes matching the
  config file path, preventing stale processes after stop
- Added sleep after PID detection for admin port readiness

Author: renecannao

providers/proxysql/proxysql.go

@@ -98,13 +98,16 @@ func (p *ProxySQLProvider) CreateSandbox(config providers.SandboxConfig) (*provi
 	}
 
 	// Write lifecycle scripts
+	// ProxySQL daemonizes by default — it forks and the parent exits.
+	// We use ProxySQL's own PID file (written to datadir/proxysql.pid) to track the process.
+	pidFile := filepath.Join(dataDir, "proxysql.pid")
 	scripts := map[string]string{
-		"start": fmt.Sprintf("#!/bin/bash\ncd %s\n%s --initial -c %s -D %s &\nSBPID=$!\necho $SBPID > %s/proxysql.pid\nsleep 2\nif kill -0 $SBPID 2>/dev/null; then\n  echo 'ProxySQL started (pid '$SBPID')'\nelse\n  echo 'ProxySQL failed to start'\n  exit 1\nfi\n",
-			config.Dir, binaryPath, cfgPath, dataDir, config.Dir),
-		"stop": fmt.Sprintf("#!/bin/bash\nPIDFILE=%s/proxysql.pid\nif [ -f $PIDFILE ]; then\n  PID=$(cat $PIDFILE)\n  kill $PID 2>/dev/null\n  sleep 1\n  kill -0 $PID 2>/dev/null && kill -9 $PID 2>/dev/null\n  rm -f $PIDFILE\n  echo 'ProxySQL stopped'\nelse\n  echo 'ProxySQL not running (no pid file)'\nfi\n",
-			config.Dir),
-		"status": fmt.Sprintf("#!/bin/bash\nPIDFILE=%s/proxysql.pid\nif [ -f $PIDFILE ] && kill -0 $(cat $PIDFILE) 2>/dev/null; then\n  echo 'ProxySQL running (pid '$(cat $PIDFILE)')'\nelse\n  echo 'ProxySQL not running'\n  exit 1\nfi\n",
-			config.Dir),
+		"start": fmt.Sprintf("#!/bin/bash\ncd %s\n%s --initial -c %s -D %s 2>&1 | grep -v '^profiling:' || true\n# ProxySQL daemonizes — wait for PID file\nfor i in $(seq 1 10); do\n  if [ -f %s ]; then\n    PID=$(cat %s)\n    if kill -0 $PID 2>/dev/null; then\n      sleep 2\n      echo \"ProxySQL started (pid $PID)\"\n      exit 0\n    fi\n  fi\n  sleep 1\ndone\necho 'ProxySQL failed to start'\nexit 1\n",
+			config.Dir, binaryPath, cfgPath, dataDir, pidFile, pidFile),
+		"stop": fmt.Sprintf("#!/bin/bash\nPIDFILE=%s\nCONFIG=%s\nif [ -f $PIDFILE ]; then\n  PID=$(cat $PIDFILE)\n  # Kill main process and any children matching our config\n  kill $PID 2>/dev/null\n  pkill -f \"proxysql.*$CONFIG\" 2>/dev/null\n  for i in $(seq 1 5); do\n    kill -0 $PID 2>/dev/null || break\n    sleep 1\n  done\n  kill -0 $PID 2>/dev/null && kill -9 $PID 2>/dev/null\n  pkill -9 -f \"proxysql.*$CONFIG\" 2>/dev/null\n  rm -f $PIDFILE\n  echo 'ProxySQL stopped'\nelse\n  # Try to find and kill by config file pattern\n  pkill -f \"proxysql.*$CONFIG\" 2>/dev/null\n  echo 'ProxySQL stopped (no pid file)'\nfi\n",
+			pidFile, cfgPath),
+		"status": fmt.Sprintf("#!/bin/bash\nPIDFILE=%s\nif [ -f $PIDFILE ] && kill -0 $(cat $PIDFILE) 2>/dev/null; then\n  echo \"ProxySQL running (pid $(cat $PIDFILE))\"\nelse\n  echo 'ProxySQL not running'\n  exit 1\nfi\n",
+			pidFile),
 		"use": fmt.Sprintf("#!/bin/bash\nmysql -h %s -P %d -u %s -p%s --prompt 'ProxySQL Admin> ' \"$@\"\n",
 			host, adminPort, adminUser, adminPassword),
 		"use_proxy": fmt.Sprintf("#!/bin/bash\nmysql -h %s -P %d -u %s -p%s --prompt 'ProxySQL> ' \"$@\"\n",