Unable to request plugins/devfiles without authentication

[sleshchenko]

Describe the bug

Devfile and Plugin Registries used to be publicly available, but with Native authentication, it's not the case anymore, which lead to complexity for some components, but it's not really clear if it's requirement or not.

And there are corner cases which may be fully broken by that change, like when in-cluster communication is not allowed.

Che version

next (development version)

Steps to reproduce

1. Deploy Che with DevWorkspaces enabled on OpenShift.
2. Try to curl devfile or plugin registry

Expected behavior

Content is received

Runtime

OpenShift

Screenshots

No response

Installation method

chectl/next

Environment

Linux

Eclipse Che Logs

No response

Additional context

No response

[sparkoo]

we've agreed that registries should be accessible without authentication. It should be doable with -bypass-auth-for or -skip-auth-regex on openshift/oauth-proxy https://github.com/openshift/oauth-proxy/blob/master/README.md#command-line-options.

On upstream oauth2-proxy, it's --skip-auth-route https://oauth2-proxy.github.io/oauth2-proxy/docs/configuration/overview/#command-line-options