Thunderbird plans to include libotr and its dependencies in official builds in
order to support Off-The-Record messaging.
When building these libraries for Windows, GCC/MinGW is currently needed.
This Docker image includes the Debian MinGW compiler and will only be used for
building libotr, libgcrypt, and libgpg-error, not Thunderbird itself.
See the docker-image kind in Thunderbird's repository for the associated
Taskcluster configuration.
Differential Revision: https://phabricator.services.mozilla.com/D57722
--HG--
extra : moz-landing-system : lando