This requires a puppet apply on prod0, and an update of the
Zulip-latest.dmg and Humbug-latest.dmg symlinks in
/src/www/dist/apps/mac and /srv/www/dist/apps/sso/mac
(imported from commit e83170a19ac2de6458a0fd43140068fab4135483)
This requires a puppet apply, and also a manual update of
the Zulip-latest.* symlinks in /srv/www/dist/apps
(imported from commit 991dd6924ba33d81f486e914bcbadfec5b350660)