Problem: Bluesky's reference PDS using a PDS_ADMIN_PASSWORD with basic auth as an admin api authz. If the PDS is managed by a team, then this becomes a shared password.
Solution: have pds-gateway manage the PDS_ADMIN_PASSWORD and have the PDS administration team login to pds-gateway via OAuth with their corresponding PDS, and then they'll be given a portal scoped to their capabilities specified by the RBAC scpecification, see ADMIN.md. Admin portal is inspired by https://github.com/betamax/pds-admin. When an admin team member wants to perform an operation (e.g. send a new users an invite code), the team member can click through the portal to do so and the pds-gateway will perform the operations with the PDS_ADMIN_PASSWORD on their behalf. This prevents the shared password problem whilst giving admins a tool to manage their PDS easier!