Log in the database, in a way that will generalize to tracking edit
history as well, when users change the status of an issue. To facilitate
easily knowing who is currently authenticated (without introducing a
circular dependency) the authentication-relaated code has also been
factored out into its own package, which is nice because we want to
replace that sooner rather than later anyway.
Fixes: #13
Change-Id: I65a544fab660ed1c295ee8f6b293e0d4945a8203
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1496
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
