More than 1 live endpoint

[HarvsG]

Is your feature request related to a problem? Please describe.

I want to preferentially boot from my local server, but if it doesn't have it I want it to go to github, not just fail

Describe the solution you'd like

Be able to specify more than one live endpoint:

# set location of custom netboot.xyz live assets
set live_endpoint http://192.168.0.28:8080, https://github.com/netbootxyz

Then each would be tried in turn.

Describe alternatives you've considered

• The netbootxyz docker container forwarding the request and then just optionally caching/saving the file
• Changing the setting every time with commenting it in/out

Additional context