[Maintenance] Add keycloak roles and permissions to stack

[devtobi]

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Problem description (optional)

Currently the Permissions defined in AuthoritiesEnum of the backend used to secure the endpoints are not available in the docker stack. This leads to the backend not working as intended by default.

Desired solution

• Required roles, permissions and policies need to be created.
• Additionally specific mappers might be necessary
• The created role should be attached to the default user

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Additional context (optional)

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[devtobi]

Further discussion about roles vs authorities in keycloak required. keycloakmigratio does currently not support the configuration of client authorization settings.

[devtobi]

See #191 for further discussion. This issue will be blocked until then.