Intermittent v9.18 build fails on Fedora COPR buildsys, always in `netmgr_test` ?

[PGNet Dev]

> The netmgr unit tests are not meant to run fully in the CI as some of it are time sensitive.
> 
> You might want to set the CI=true environment variable to reduce the set of the netmgr unit tests to just the more reliable subset.

thx, trying that now @ COPR

in the case that it does the trick, should that be dealt with in general in the .spec itself, perhaps detecting build env?  or preferably in the specific buildsys' env, set, e.g., by rpm macros ... ?

and, will that CI=true export likely still be the case for the upcoming per-transport separate tests,

  https://github.com/isc-projects/bind9/commit/37a1be5acc32244cec03cedc1bd46bc4aa0fbc18

?