* Ensure that the redis cache is actually used in the "trivial" case
(`with-postgresql-and-redis`)
* Test against all Nextcloud versions we've packaged
* Actually set a secret to make sure that the provided secret is
properly read by Nextcloud.
* Add myself as maintainer to the secret-test to make sure that I don't
miss any more changes like this that could break the functionality of
that feature.
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