feat: workspace docker image (#55)

docker-compose.yml

@@ -1,7 +1,7 @@
 # This compose file can be useful to develop and debug Jupyterhub code locally.
 # It is not meant to be deployed in production.
 
-version: '3'
+version: "3.9"
 
 services:
   jupyterhub:
@@ -38,8 +38,6 @@ services:
 
   jupyter:  # just used for building - the jupyterhub service will spawn jupyter containers on demand
     build: jupyter
-    networks:
-      - openhexa
     platform: linux/amd64
     image: openhexa-base-notebook
     command: echo

jupyterhub/config/jupyterhub_config.py

@@ -105,6 +105,11 @@ async def pre_spawn_start(self, user, spawner):
 
             # Let's use the hash generated on the app side
             spawner.pod_name = f"jupyter-{credentials_data['notebooks_server_hash']}"
+
+            # SET DOCKER IMAGE
+            if credentials_data.get("image") is not None:
+                self.log.info(f"Using custom image: {credentials_data['image']}")
+                spawner.image = credentials_data["image"]
 
             # Disable persistent storage in workspaces
             if len(spawner.volumes) > 0 and spawner.volumes[0]["name"].startswith(