Since we're building our own OTP for Mac, the idea was not to
accidentally building agains something we happen to be testing at the
moment, like the latest RC. This check turned out to be a little bit
too annoying in practice though. We plan to automate builds on CI
in the near future so we wouldn't need it the anyway.
Closes#1177
* Add LIVEBOOK_SHUTDOWN_ENABLED
Previously we relied on code:get_mode(), but since
releases are starting in interactive mode to use
less memory, we need a clearer mechanism.
* Move shutdown feature check to Livebook.Config
Co-authored-by: Jonatan Kłosko <jonatanklosko@gmail.com>
* Run in interactive mode: it uses less memory and improves
boot time, which is the most desired properties for a dev tool
* Do not use releases/cookie, instead generate one on boot
