So i am facing the very same task atm. I went ahead and used the onpremise repo and tried hacking on top. I think in theory that should work as it worked for other plugins, but it fails because python-ldap needs the libldap2-dev package to be able to successfully “pip install python-ldap”. Is there any way around completely copying the while docker hub sentry setup? That would be prohibitively reinventing the wheel.
Disclaimer: I am a Docker newbie 
Cheers,
Thorsten