show if the mail server settings are not set or verified

[szaimen]

Close #30962

Signed-off-by: szaimen [email protected]

For my own testing

docker run -it \
-e SERVER_BRANCH=enh/30962/show-mail-server-settings-in-overview \
-p 8443:443 \
-e TRUSTED_DOMAIN=192.168.146.128 \
--name nextcloud-easy-test \
ghcr.io/szaimen/nextcloud-easy-test:latest

[szaimen]

/backport to stable23

[MichaIng]

setAppValue() adds a new database row, not a config.php value, right? I was thinking whether it could be even made a flag in the local cache. On the other hand the mail server test runs only once when mail settings are changed, so that the result needs to be made persistent, right? Theoretically setup checks could trigger a new test, but probably too much overhead. EDIT: Ah I see it requires a verification mail as well, not applicable to trigger by setup checks. Then a persistent flag in the database indeed seems to be best solution.

[szaimen]

acceptance-app-files-sharing failure unrelated