To ease the use of the audience with the JWTService, we choose to create
an enum holding all the possible values and then use them in the Yhub
and Y-converter services.
For now the only token we will need is ont with the admin claim set to
True. To not repeat the creation of this token again and again, we
created a dedicated method to issue this token in the JWTService class.
The yhub service will need our public key in order to validate the jwt
token we will used. We choose to expose a jwks endpoint as it is a
standard wat to do this.
Manuel Raynaud