Add EKSTER_BASEURL to environment and docs

README.md

@@ -36,7 +36,7 @@ Start redis
 
 Start eksterd and pass the redis and port arguments.
 
-    eksterd -redis localhost:6379 -port 8090
+    EKSTER_BASEURL=https://example.com eksterd -redis localhost:6379 -port 8090
 
 You can now access `eksterd` on port `8090`. To really use it, you should proxy
 `eksterd` behind a HTTP reverse proxy on port 80, or 443.

docker-compose.yml

@@ -15,3 +15,4 @@ services:
     environment:
       - "FEEDBIN_USER="
       - "FEEDBIN_PASS="
+      - "EKSTER_BASEURL="