[Method1]
1.Install System to SD Card with Rspberry Pi Imager(Raspberry Pi OS Lite or Ubuntu Server)
Tips: also setting up the ssh connection and wifi ssid/password via Rspberry Pi Imager.
Rspberry Pi Imager https://www.raspberrypi.com/software/ (software download)
2.excute rb3_install_jenkins.sh
[Method2]
1.install docker with command "curl -sSL https://get.docker.com | sh"
2.with rootless mode with command "sudo usermod -aG docker [your user name]
3.follow https://hub.docker.com/r/jenkins/jenkins to finish the install.