Fixes the current version appearing as an update. Also fixed error
handling when no update is available, which obviously hadn't previously
been experienced.
If enabled, jfa-go pings buildrone (hosted at builds.hrfee.pw) every 30
min for new updates. If there is one, it gets information (and if
applicable, a binary) from the appropriate source (buildrone, github, or
dockerhub) and displays it on the admin page. You can switch update
channels between stable and unstable. For binary releases, updates are
downloaded automatically and installed when the user presses update.
Since this obviously introduces some "phone-home" functionality into
jfa-go, I just want to say IPs are not and will not be logged by
buildrone, although I may later introduce functionality to give a rough
idea of the number of users (again, no IPs stored). The whole thing can
also be turned off in settings.