GAIA-X Authority VCs - Infrastructure Implementation

[marcgs]

feature #78
after #18 and https://github.com/agera-edc/MinimumViableDataspace/issues/151

Description

Implementation story according to outcome of #18

Acceptance Criteria

• [x] All verifiable credentials can be validated against the public key of the issuer's DID document
• [x] GAIA-X membership Verifiable Credential can be issued by an external authority trusted by dataspace participants and can be verified by the dataspace authority
• [x] MVD Membership verifiable credentials signed by the dataspace authority can be issued and verified by any dataspace participant
• [x] Documentation on how certificate infrastructure is handled for the MVD

Tasks

• [x] Generate private and public keys for GAIA-X in the CD workflow.
• [x] The GAIA-X private key is made available to download as Github artifact so that it can be used in the participant deployment workflow to generate GAIA-X membership Verifiable Credentials.
• [x] Populate the GAIA-X VCs to participant's IdentityHub using the Identity Hub CLI
• [x] Add/update doc on how certificate infrastructure is handled for the MVD

[zeier]

Currently blocked by the missing IdentityHub implementation, requires IdentityHub CLI.