Spike: PoC for single-host/default-host mode for Che Theia

[skabashnyuk]

Is your task related to a problem? Please describe.

The goal of the task is a technical study of #12971 (comment) problem. If that possible provide some variants of Poc how to solved. To narrow the scope at this moment we can concentrate only on Che Theia and devfiles from https://github.com/eclipse/che-devfile-registry

Describe the solution you'd like

single-host/default-host mode for Che Theia is working

Describe alternatives you've considered

n/a

Additional context

#12971

[slemeur]

cc @akervern

[metlos]

So I've made some initial progress into making this working again. I've started with single-user mode and have found that the original way this was developed only works with nginx-ingress-controller in version 0.21.0 or older (present in minkube <= 0.35.0). There was an incompatible change in version 0.22.0 (in minikube 1.0.0 or newer) that breaks our approach and we need to modify the way we define the ingress controller related annotations as well as how we define the paths handled by the ingresses. Please refer to the PR #14134 where the progress is being reported and tracked.

Note that the nginx-ingress-controller is currently on version 0.25.0.

Also note that I am not aware of this being tested or made working with any other ingress controller. If such tests have been performed, could you please point me to the results, @eclipse/eclipse-che-qa?

[metlos]

I've created issue #14229 to track testing on different cloud platforms. I've also created #14189 to track the support of single/default-host strategy on multi-user.

As such, I think this spike issue can be closed.