chectl "next" channel with OLM installer should install nightly Che.

[AndrienkoAleksandr]

Is your enhancement related to a problem? Please describe.

During some transition period, we implemented installation"latest" Che for chectl "next" channel, with warning about that. Ideally we should do installation "nightly" Che for "next channel". It should be useful for testing Che via olm installer.

Describe the solution you'd like

We can set up for https://github.com/eclipse/che-operator nightly job to push Eclipse Che preview CatalogSource image and use this image in the chectl to install "nightly" Che. Prototype of such images was implemented by QA https://github.com/eclipse/che-operator/blob/master/olm/eclipse-che-preview-kubernetes/Dockerfile and https://github.com/eclipse/che-operator/blob/master/olm/eclipse-che-preview-openshift/Dockerfile

Describe alternatives you've considered

We can use quay.io application registry and OperatorSource to install nightly Che, but OperatorSource is depracated and seems it was even removed from the latest OLM manager. So it is an option, but I would say - very bad option.

[AndrienkoAleksandr]

I think implementation should have to steps:

• set up nightly ci to push images
• use CatalogSource images in the chectl