[update] use jammy in docker template
To be able to use dune 2.10 we need at least CMake 3.22.1. This is not used when using phusion/baseimage:focal.
With use of phusion/baseimage:jammy-1.0.4 this is possible.
To be able to use dune 2.10 we need at least CMake 3.22.1. This is not used when using phusion/baseimage:focal.
With use of phusion/baseimage:jammy-1.0.4 this is possible.