Make the Gemfile's location known from anywhere on appliances.
Make the Gemfile's location known from anywhere on appliances.

Bundler binstubs residing outside of /var/www/miq/vmdb/bin can't find
the application's Gemfile without this environment variable set.

https://bugzilla.redhat.com/show_bug.cgi?id=1207842

[skip ci]

ManageIQ/manageiq-appliance,ManageIQ/manageiq-appliance,ManageIQ/manageiq-appliance