Fix factory build

[bugfinder]

build on factory has been broken for long enough that some specfiles are not even resolvable any more

[hennevogel]

Added our factory repo to the test build

[hennevogel]

I'm not sure if this makes too much sense this way. The ruby version is probably more a question of O:S:U project conf.

There is this workaround

# Factory would prefer ruby3.2 atm
Ignore: ruby3.2 ruby3.2-rubygem-gem2rpm

and we also in general disabling all ruby versions except the one we are using.

## Disable gem building for everything but Ruby 3.1

Prefer: -ruby2.5-rubygem-gem2rpm
Prefer: -ruby2.1-rubygem-gem2rpm

%define _with_ruby31           1
%define _with_ruby30           0
%define _with_ruby27           0
...

[hennevogel]

I've added some project conf changes. Let's see...

[bugfinder]

well, even with adding prefers you can not guarantee that the higher ruby version is not installed
futhermore the ruby version has already been hardcoded in several places in the sources, this change
is meant to make this consistent

[hennevogel]

you can not guarantee that the higher ruby version is not installed

Sure, the prefer was a workaround...

[hennevogel]

you can not guarantee that the higher ruby version is not installed

Added the last bits to the project conf, factory should be working now.