ImapSync Service module missing in CommunityServer repo

[AdrianHamod]

I noticed this repo include the ImapSync service, but it's missing in ONLYOFFICE/CommunityServer repo. That being said, the one click installer that sets up the entire infrastructure does deploy the MailImap service in the community server container.

But if i try to compile and deploy community server on my own, im missing the sources for this service. How can I build it myself? How is it build in the official docker image?