fix: use Linux timeout command for apt-get installation

Use the Linux timeout command instead of context timeout for apt-get
since exec.CommandContext doesn't properly kill child processes when
using sudo. This ensures apt-get is properly terminated after 60 seconds.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: claude

internal/sqltest/native/mysql.go

@@ -96,21 +96,18 @@ func startMySQLServer(ctx context.Context) (string, error) {
 	if _, err := exec.LookPath("mysql"); err != nil {
 		slog.Info("native/mysql", "status", "installing")
 
-		// Pre-configure MySQL root password (with timeout)
-		debconfCtx, debconfCancel := context.WithTimeout(ctx, 10*time.Second)
-		defer debconfCancel()
-		setSelectionsCmd := exec.CommandContext(debconfCtx, "sudo", "bash", "-c",
+		// Pre-configure MySQL root password (with timeout using Linux timeout command)
+		setSelectionsCmd := exec.Command("sudo", "timeout", "10",
+			"bash", "-c",
 			`echo "mysql-server mysql-server/root_password password mysecretpassword" | sudo debconf-set-selections && `+
 				`echo "mysql-server mysql-server/root_password_again password mysecretpassword" | sudo debconf-set-selections`)
 		setSelectionsCmd.Env = append(os.Environ(), "DEBIAN_FRONTEND=noninteractive")
 		if output, err := setSelectionsCmd.CombinedOutput(); err != nil {
 			slog.Debug("native/mysql", "debconf", string(output))
 		}
 
-		// Try to install MySQL server (with timeout)
-		installCtx, installCancel := context.WithTimeout(ctx, 60*time.Second)
-		defer installCancel()
-		cmd := exec.CommandContext(installCtx, "sudo", "apt-get", "install", "-y", "-qq", "mysql-server")
+		// Try to install MySQL server (with 60 second timeout using Linux timeout command)
+		cmd := exec.Command("sudo", "timeout", "60", "apt-get", "install", "-y", "-qq", "mysql-server")
 		cmd.Env = append(os.Environ(), "DEBIAN_FRONTEND=noninteractive")
 		if output, err := cmd.CombinedOutput(); err != nil {
 			// If apt-get fails (no network or timeout), return error