Nextcloud 30 support

[Glandos]

Is your feature request related to a problem? Please describe.
I'm about to migrate to Nextcloud 30 (aka Hub 9), and wanted to know if this application is ready for it.

Describe the solution you'd like
Declare compatibility with NC 30.

Describe alternatives you've considered
Not migrating.

Additional context
I'm ready to test if needed.

See #240 and #246 for the usual patches.

[prismopensource]

Happy to sponsor a bit of time for @violoncelloCH if that's what's needed to get a Nextcloud 30 compatible release out of the door this fall.

[Glandos]

My first test with IMAP worked fine.

[ervee]

I just enabled the App in my NC30 test installation and configured it with IMAP. Works fine with my Dovecot backend. Also logged in from an Android Nexcloud App and that also works fine.

[ervee]

I updated my NextCloud v29 to v30 via sudo -E -u www-data /usr/bin/php --define apc.enable_cli=1 /var/www/nextcloud/updater/updater.phar and after the update was done enabled the user_external App via sudo -E -u www-data /usr/bin/php --define apc.enable_cli=1 occ app:install user_external --force. This works fine for a couple of days now.

[ickedude]

Works fine with v30.0.2 and ssh backend.

[bartucxp]

Does not work with 30.0.2 and IMAP backend.

[ervee]

I just updated to 30.0.2 and the user_external App got disabled. You actually see it in the occ upgrade output:

[...snip...]
Updating database schema
Updated database
Disabled incompatible app: user_external
Updating <circles> ...
Repair step: Upgrading Circles App
[...snip...]

Not sure if you would see this using other update methods.

After a quick occ app:install user_external --force (or force enable the App in the Admin UI) I can login in NC 30.0.2 without issue using IMAP.

[MCF]

Just updated to 30.0.2 The update screen in 29.0.8 showed user_external as not being compatible with version 30.0.2 - but it all just worked as soon as the update was completed. There was no need to force install user_external. Everything was fine

I'm using the SSH backend FWIW.

[jensb]

Yes, please enable this plugin for NC30! I also need it badly (for IMAP) and I'm perfectly willing to help if there are bugs to be fixed.