Proper multi domain support #684
Description
Describe why it is important and where it will be useful
This does not currently seem to be a concern, nor to work properly with nginx setup as shown in the documentation
Describe your proposed solution
Make sure HaRP accepts all domains from the valid hostnames list and to properly adjust the X-Frame-Options and related headers accordingly for each one.
I'm unsure if additional work needs to be done for the dependencies of ex_app applications
Describe alternatives you've considered, if relevant
No response
Additional context
No response