fix: added psycog2 package to init container and set grader network

Author: florian-jaeger

examples/docker_compose/Dockerfile-DBInit

@@ -2,7 +2,7 @@ FROM postgres
 
 # Install git
 RUN apt-get update && \
-    apt-get install -y python3 python3-venv && \
+    apt-get install -y python3 python3-venv python3-psycopg2 && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 

examples/docker_compose/jupyterhub_config.py

@@ -26,7 +26,7 @@
 c.JupyterHub.spawner_class = "dockerspawner.DockerSpawner"
 
 c.DockerSpawner.use_internal_ip = True
-c.DockerSpawner.network_name = "grader_network"
+c.DockerSpawner.network_name = "grader_default"
 
 c.DockerSpawner.remove = True