This introduces `COMM_NODE_ROLE` which specifies whether a node is a primary or secondary node.
Certain logic in `keyserver/src/keyserver.js` should only be performed by a primary node. This includes:
- run the migration
- establish tunnelbroker connection
- print the QR Code
- create authoritative keyserver config files
Both secondary and primary nodes should still perform:
- have the master process create fork processes
- route express traffic
- verify the user is logged in