feat: enable 15Gi size limit on emptyDir (#7081)

* feat: enable 15Gi size limit on emptyDir

* docs: add note about reclaiming storage

Author: agoose77

config/clusters/projectpythia-binder/binderhub.values.yaml

@@ -120,6 +120,9 @@ binderhub-service:
     nodeSelector:
       hub.jupyter.org/node-purpose:
       capi.stackhpc.com/node-group: user-m3-large
+    storage:
+      emptyDir:
+        sizeLimit: 15Gi
   config:
     GitHubRepoProvider:
       allowed_specs:

docs/howto/features/imagebuilding.md

@@ -189,4 +189,13 @@ to effectively repeat certain config values below.
         node_selector:
           node.kubernetes.io/instance-type: <e.g. r5.xlarge>
 
+1. Mark the Docker storage volume as ephemeral, and owned by the kubelet:
+
+   ```yaml
+   binderhub-service:
+     dockerApi:
+       storage:
+         emptyDir:
+           sizeLimit: 15Gi
    ```
+   This will ensure that once the volume exceeds the storage limit, the storage is ultimately reclaimed by the node. This is particularly useful for clusters which do not regularly recycle nodes, such as nodepools that do not scale to zero.

helm-charts/basehub/Chart.yaml

@@ -15,7 +15,7 @@ dependencies:
     version: 4.0.0
     repository: https://jupyterhub.github.io/helm-chart/
   - name: binderhub-service
-    version: 0.1.0-0.dev.git.316.h27f15f4
+    version: 0.1.0-0.dev.git.318.h477a6fa
     repository: https://2i2c.org/binderhub-service/
     condition: binderhub-service.enabled
     # If bumping the version of dask-gateway, please also bump the default version set