Use Docker - this link also tells you to install apparmor which for some unknown reason the official docs don't and it fails
Working with containers - the official docs are then fine for learning to work with the LXCs that you created or pulled
Point and click with Kitematic - if you prefer the GUI way
Thousands of predefined containers already exist including BOINC.
I am using the "laurentmalvert/docker-boinc" container for this excercise.
The only bit I need to script is the add-project part: get the new container IP, RPC connect & add project with participant name and password.
I was doing that manually last night. I'd script that before scale-out.
Maybe later. The super car qualifying is on at Phillip Island.