If you are using an SSO IDP, users in your organisation will be able to log in to Kore directly. Existing team users can invite other users directly to those teams, even if they have not logged in to Kore before, using an invite link.
If you are not using an SSO IDP, or want to add an additional non-SSO user, you can do this from the CLI, with two steps:
You can add existing users, SSO or local, to a team using the kore create member CLI command or via the team's Members page on the UI.
If the user does not already exist, the CLI can generate an invite link or you can find the invite link on the team Members page.
Like everything in Kore, all things are resources and can be managed within the confines of a traditional pipeline.
Here's an example of how you might define a user and its membership to one or more teams from YAML files: