concise names for docker containers and links

config/code_ocean.yml.docker

@@ -37,6 +37,7 @@ default: &default
   runner_management:
     # When enabled, CodeOcean delegates the handling and management of (containerized) runners
     # to a dedicated runner management. Otherwise, code executions are performed locally using
+    #<% if ENV['POSEIDON_HOST'] != '' -%>
     # Docker and without pre-warming support (one container per execution).
     enabled: true
     # The strategy to use. Possible values are: poseidon, docker_container_pool
@@ -44,7 +45,13 @@ default: &default
     # The root URL of the runner management to use (include any API prefix if required)
     # If a hostname is specified and the target host is reachable via IPv6, the WebSocket
     # connection might not use the IPv6-to-IPv4 fallback but rather fail unexpectedly.
-    url: http://127.0.0.1:7200/api/v1
+    url: http://poseidon:7200/api/v1
+    #url: http://<%= ENV['POSEIDON_HOST'] %>/api/v1
+    #<% else %>
+    #enabled: false
+    #strategy: poseidon
+    #url: http://poseidon.example.org/
+    #<% end -%>
     # The root certificate authority to trust for TLS connections to the runner management (Poseidon only)
     # ca_file: /example/certificates/ca.crt
     # The authorization token for connections to the runner management (Poseidon only)