mailu/core
Dario Ernst 66df7a31b0 Unify and coerce booleans from env used in admin
At some places, the string that DOMAIN_REGISTRATION is got used like a boolean
(an easy misassumption to make while in python and dealing with the config
dict), making `DOMAIN_REGISTRATION=False` act as a truthy value. To stop such
future problems from happening, coerce environment config strings to real
bools.

closes 
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admin Unify and coerce booleans from env used in admin
dovecot remove (broken) FTS
nginx Cleanup syntax and fix typo
none pin alpine-version for 'none'-image
postfix Cleanup syntax and fix typo