[enh] Compile sieve script as needed and fix permissions in dovecot conf_regen
[enh] Compile sieve script as needed and fix permissions in dovecot conf_regen

YunoHost/yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost