Map Download Button (#201)

Closes #145.

All the backend should be implemented here, ~~I just don't know how to make a download button on the frontend.~~ I made a button, we'll see if it works.

- [x] ~~Add asset download api key to infra~~ this was never required

Reviewed-on: #201
Co-authored-by: Quaternions <krakow20@gmail.com>
Co-committed-by: Quaternions <krakow20@gmail.com>

compose.yaml

@@ -33,6 +33,8 @@ services:
       "--auth-rpc-host","authrpc:8081",
       "--data-rpc-host","dataservice:9000",
     ]
+    env_file:
+      - ../auth-compose/strafesnet_staging.env
     depends_on:
       - authrpc
       - nats