[GNC] Build in docker, how to install on different laptop

[Hajo Hindriks]

I have an older laptop running ubuntu 20.04 LTS, I want to update
gnucash on it without installing all the build tools and dependencies
and I don't want to use flatpack either. So I used a docker container
based on 20.04 LTS to build the tag 4.9. So far so good, but I don't
know how to install to the other laptop, any advice on this? Do I need
to investigate how to create a deb file? When calling ninja install it
seems to write only to /opt/gnucash, would it be sufficient to copy this
foler to the laptop? There are messages of "set runtime path of "..." to
"...", how could I replicate this on the laptop?

And one small question aside, I run bin/gnucash --version in the build
dir and got the following output:

# bin /gnucash-cli --version
GnuCash 4.8 development version
Build ID: git 4.9+(2021-12-18)

is the 4.8 expected in this context?

Hajo