Sentry Docker image based on current master

Sentry only builds Docker images once they do a release. The latest one (9.0) is very old and lacks some of the features my organisation needs.

Is there a Sentry Docker image build from source somewhere?

There is a process and scripts, though Iā€™m not sure we documented it. I know I ā€“ being not familiar with Docker ā€“ struggled to try to do it a year or so ago.

/cc @matt should just work, if not, lemme know.