8e3201fa-ls43

LinuxServer Changes:

Rebasing to alpine 3.12.
quassel-webserver Changes:

settings: Fix ignoring 'securecore: false' default (#290)

Don't use || to set default value for "securecore", instead check
the type of the variable. Otherwise, false evaluates to, well, false,
and "securecore" can never be defaulted to false. This fixes ignoring
the custom default setting "securecore: false" in settings-user.json