The Dovecot Team creates ImapTest packages for several different Linux distributions.
Instructions on how to configure your system to install the packages can be found on the Dovecot Community Repositories page.
Static binaries are automatically compiled whenever a commit is pushed to the source repository.
Download link: https://github.com/dovecot/imaptest/releases/tag/latest
ImapTest can also be compiled from source. See Installation for details.