This allows to declaratively configure an S3 class object storage as the
primary storage for the nextcloud service. Previously, this could only
be achieved by manually editing the `config.php`.
I've started testing this today with my own digitalocean nextcloud
instance, which now points to my digitalocean S3-compatible "Space" and
all appears to be working smoothly.
My motivation for this change is my recent discovery of how much cheaper
some S3-compatible object storage options are compared to digitalocean's
"Volume" options.
Implementation follows the "Simple Storage Service" instructions here:
https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/primary_storage.html
I have neglected to implement a submodule for the OpenStack Swift
object storage as I don't personally have a use case for it or a method
to test it, however the new `nextcloud.objectstore.s3` submodule should
act as a useful guide for anyone who does wish to implement it.
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