Question about platform and real time kernel

[Longyouyuan]

Hi, The ros2 humble is based on Ubuntu 22, why franka_ros2 can also run on Ubuntu 20.04? My pc is Ubuntu 20.04, if I use Docker Container Installation method, either with or without VScode, does it means I don't need to do anything else to run the real robot (in term of software part, like I don't need to manually install real time kernel and so on)?

Thanks!