Give tenant user admin role

To give an existing user in a tenant admin role:

Setup

1. SSH to the webapp instance in the stack, see instructions here
2. Open a rails console, see instructions here

Add admin role

1. Switch into the tenant: AccountElevator.switch!('tenant.host.name.here')
2. Grab the user instance: user = User.find_by(email: '[email protected]')
3. Add the role for the current site instance: user.add_role(:admin, Site.instance)