build ubi8 based che-server Dockerfile and push to quay

[skabashnyuk]

Is your task related to a problem? Please describe.

https://github.com/eclipse/che/blob/master/dockerfiles/che/rhel.Dockerfile File is used in Che downstream process.
We would like to give an opportunity to use/test this image widely.

Describe the solution you'd like

build ubi8 based che-server Dockerfile and push to quay

Describe alternatives you've considered

n/a

Additional context

n/a

[nickboldt]

I'm assuming we want a GH action to build a container and push to quay on every push. Do we need pull-request and manual triggers too?

[skabashnyuk]

we want a GH action to build a container

+1

every push

+1 . let say with the tag latest

pull-request

+1

manual triggers too

Not sure why we need it. Do you?

[nickboldt]

ubi8-latest probbly better than just latest to avoid collision with alpine builds.

[mkuznyetsov]

After moving from Centos CI to GH Actions workflow, now nightly builds feature new che server image based on ubi8 with tag rhel-nightly

[nickboldt]

I thought we decided to use :ubi8-latest, but it seems like :latest refers to RELEASES, where :nightly and :rhel-nightly are CI builds.

So this makes sense as long as no one (or job/process/bot) is expecting the other name. +1, looks good.