I must be doing something fundamentally wrong.
Everything with the private feed seems to be working great! When I try accessing the cache, i get a lot of 404 errors, or using nuget list - it tells me no packages found. I left everything default in the container.

My IPAddress replaced with "liget" -
nuget list Prism -Source http://liget:9011/api/cache/v3/index.json
this works fine when pointing to nuget.org but i do get a warning when I run it against liget
WARNING: This version of nuget.exe does not support listing packages from package source

working query
https://api-v2v3search-0.nuget.org/query?q=NuGet.Versioning&prerelease=false
non-working, i tried every variation of api/cache/v3/index.json
http://liget:9011/api/cache/v3/index.json/query?q=NuGet.Versioning&prerelease=false

I have confirmed internet access by both the VM and Container where this is running.. so.... now i'm stuck.