Federated authentication for SCS Consumers

[fkr]

As a SCS consumer, I want to have federated authentication.

Rough outline:

https://scs.sovereignit.de/nextcloud/apps/files/?dir=/Sovereign%20Cloud%20Stack/SIGs/IAM&openfile=70044

Definition of Ready:

• [x] Input from Kurt
• [x] Create Issue for Support SCS consumers using their own IdP below
• [ ] #194
• [ ] All related items have been covered in user stories
• [ ] User Story is small enough to be finished within one sprint
• [ ] User Story is clear and understood by the whole team
• [ ] Acceptance criteria are defined
• [ ] Acceptance criteria are clear and understood by the whole team

Definition of Done:

• [x] #26
• [ ] #182
• [x] #254
• [ ] #258
• [ ] Support SCS consumers using their own IdP
• [ ] All acceptance criteria are met
• [ ] Changes have been reviewed
• [ ] CI tests have been implemented
• [ ] Setup for testing Federation to external IdP can bee rolled out for CI tests
• [ ] CI tests have run successfully
• [ ] Documentation has been updated
• [ ] Release Notes have been updated

[fkr]

Discussed in Team 3 meeting on April 14th: This epic will be further refined in CW 16. Proposal for a timeslot has been sent out to Arvid, Jeff and Mathias.

[fkr]

To be discussed in SIG IAM on April 29th (w/ Kurt) To be discussed in Team 2 on May 2nd

[reqa]

Etherpad from the hacksessions: https://input.osb-alliance.de/p/2022-scs-sig-iam

[fkr]

This epic will be refined in Team IAM meeting in CW 5.