[terraform] deploy landing on comm services cluster
Summary:
This puts up landing on our comm services cluster. This will require a new keyserver image with
https://phab.comm.dev/D12927
Depends on D12929
Test Plan: Tested with custom image and accessed landing page at comm.app
Reviewers: varun, bartek
Reviewed By: varun
Subscribers: ashoat, tomek
Differential Revision: https://phab.comm.dev/D12930