'date -u' returns the time in UTC. 'git log' uses local time. In
result, when a machine is on for example +0100, it would generate
the changelog of 7 days 1 hour, instead of 7 days. This is a silly
oversight.
This release pipeline creates all the official release binaries,
and publishes them as artifacts. Currently it can only produce
nightlies and custom builds; stable/testing release binaries are
untested.
This commit also splits up the pipeline in small bits, to both
improve readability, and to share code with the CI pipeline where
possible.