This issue has been just raised. A RPM package can run scripts but they are not designed for that task.
This kind of changes would go into something like a configuration manager but SFOS is missing completely such a tool. On the other hand, the tool that could have fulfill that role was Patch Manager but the evolution of PM gone in the direction of applying in-memory-only patches that do not survive to a reboot because otherwise a patch can mess up the system. This choice, as demonstrated in trying to patches some system configuration files, prevent to have a configuration manager tool with the minimum effort starting from the current PM.
However, because a configuration manager can potentially interfere also with the RPM installation / removing / update and for sure with the SFOS version upgrade no any way of applying persistent changes have been made but SSH. Hence, when you use SSH, it is your fault!
Welcome aboard, sailor! 
It exists a package as described into DNS CACHING section of this guide
The name of that package is dns alternative.
It is not part of the SFOS, but the OpenRepos community contributions.