* fix: don't add cairn-postgresql as a dependency when CAIRN_RUN_POSTGRESQL is false
* fix: don't manage cairn-clickhouse permissions CAIRN_RUN_CLICKHOUSE is false
* fix: add missing CAIRN_POSTGRESQL_HOST and CAIRN_POSTGRESQL_PORT settings to allow usage with external postgresql DBs
This upgrade includes SSO login. Finally! We can now login to Superset
via the LMS. Thanks to OARS for providing the base security manager
implementation!
Superset was ignoring the cairn-redis container, so we decided to remove it.
But the superset celery worker was writing to the /0 database, which conflicts
with the default celery database from the lms/cms. We fix this issue by running
in a different database.
The CELERY_RESULT_BACKEND seemed to be completely useless, so we got rid of it.
