Add mercurial to the list of dependencies in tools/ansible/roles/tbb-builder/tasks/main.yml
With legacy/trac#26843 (moved) we now require mercurial to be installed. We should add it to the list of dependencies in tools/ansible/roles/tbb-builder/tasks/main.yml.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information