sse-server does not support using a different base uri from frontend
presigned urls, and backend comminication channels.

Therefore for local development, we must expose minio on the localhost,
and use /etc/hosts to resolve lookups for the hostname `minio`

this way sse-server can use the hostname `minio` for both frontend
presigned urls and backend communication.

configuration will have to differ for cloud deployments where traffic
is only allowed port on 80/443.