Give ability to configure provision from occ command

[lebuzzer]

Is your feature request related to a problem? Please describe.

I try to setup a docker-compose instance of nextcloud based on official image using post-installation scripts.
for the moment everything (core / ldap / contact / calendar) is done except mail provisioning.
there is no easy way to setup provisioning from occ command.

Describe the solution you'd like

like ldap, permit to populate provision table with following commands :

• occ ldap:create-empty-config
• occ ldap:set-config <created config id> <param> <value>

which could become for mail :

• occ mail:provisioning:empty-create (output is created id of oc_mail_provisionings)
• occ mail:provisioning:set <id> <param> <value>
• example :
  • occ mail:provisioning:empty-create
    (example return "2" on stdout)
  • occ mail:provisioning:set 2 provisioning_domain domain.tld
  • occ mail:provisioning:set 2 email_template %EMAIL%
  • occ mail:provisioning:set 2 imap_user %EMAIL%
  • occ mail:provisioning:set 2 imap_host imap.domain.tld

Describe alternatives you've considered

I build an instance with cron and add mariadb client to insert configuration I need.
But this is a bad solution to add tools in instance just for initial setup.

Additional context

No response