PV are not mounted with correct permissions inside pods

Hello,

I'm trying to deploy Jupyterhub on OVH k8s cluster but I can't make it run with default configuration.

`config.yaml`:

```yaml
# This file can update the JupyterHub Helm chart's default configuration values.
#
# For reference see the configuration reference and default values, but make
# sure to refer to the Helm chart version of interest to you!
#
# Introduction to YAML: https://www.youtube.com/watch?v=cdLNKUoMc6c
# Chart config reference: https://zero-to-jupyterhub.readthedocs.io/en/stable/resources/reference.html
# Chart default values: https://github.com/jupyterhub/zero-to-jupyterhub-k8s/blob/0883f9927b35ea2efad490a8e19dda8a4a8e12dc/jupyterhub/values.yaml
# Available chart versions: https://jupyterhub.github.io/helm-chart/
#
```

```shell
$ kubectl get node
NAME STATUS ROLES AGE VERSION
nodepool-813c1e34-xxxx-xxxx-98-node-121a16 Ready 4h v1.22.2
```

```shell
$ helm version
version.BuildInfo{Version:"v3.6.3", GitCommit:"d506314abfb5d21419df8c7e7e68012379db2354", GitTreeState:"clean", GoVersion:"go1.16.5"}
```

```bash
helm upgrade --cleanup-on-fail \
--install skl-jhub jupyterhub/jupyterhub \
--namespace skl-jhub \
--create-namespace \
--version=1.2.0 \
--values config.yaml
```
Log output :

```shell
$ kubectl logs --namespace skl-jhub hub-87f985879-btlkc
Loading /usr/local/etc/jupyterhub/secret/values.yaml
No config at /usr/local/etc/jupyterhub/existing-secret/values.yaml
[I 2021-12-14 12:23:46.895 JupyterHub app:2479] Running JupyterHub version 1.5.0
[I 2021-12-14 12:23:46.895 JupyterHub app:2509] Using Authenticator: jupyterhub.auth.DummyAuthenticator-1.5.0
[I 2021-12-14 12:23:46.895 JupyterHub app:2509] Using Spawner: kubespawner.spawner.KubeSpawner-1.1.0
[I 2021-12-14 12:23:46.896 JupyterHub app:2509] Using Proxy: jupyterhub.proxy.ConfigurableHTTPProxy-1.5.0
[E 2021-12-14 12:23:46.907 JupyterHub app:2989]
Traceback (most recent call last):
File "/usr/local/lib/python3.8/dist-packages/jupyterhub/app.py", line 2986, in launch_instance_async
await self.initialize(argv)
File "/usr/local/lib/python3.8/dist-packages/jupyterhub/app.py", line 2521, in initialize
self.init_db()
File "/usr/local/lib/python3.8/dist-packages/jupyterhub/app.py", line 1723, in init_db
dbutil.upgrade_if_needed(self.db_url, log=self.log)
File "/usr/local/lib/python3.8/dist-packages/jupyterhub/dbutil.py", line 112, in upgrade_if_needed
orm.check_db_revision(engine)
File "/usr/local/lib/python3.8/dist-packages/jupyterhub/orm.py", line 771, in check_db_revision
current_table_names = set(inspect(engine).get_table_names())
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/inspection.py", line 64, in inspect
ret = reg(subject)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/reflection.py", line 182, in _engine_insp
return Inspector._construct(Inspector._init_engine, bind)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/reflection.py", line 117, in _construct
init(self, bind)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/reflection.py", line 128, in _init_engine
engine.connect().close()
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/base.py", line 3165, in connect
return self._connection_cls(self, close_with_result=close_with_result)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/base.py", line 96, in __init__
else engine.raw_connection()
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/base.py", line 3244, in raw_connection
return self._wrap_pool_connect(self.pool.connect, _connection)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/base.py", line 3214, in _wrap_pool_connect
Connection._handle_dbapi_exception_noconnection(
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/base.py", line 2068, in _handle_dbapi_exception_noconnection
util.raise_(
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/util/compat.py", line 207, in raise_
raise exception
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/base.py", line 3211, in _wrap_pool_connect
return fn()
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/pool/base.py", line 307, in connect
return _ConnectionFairy._checkout(self)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/pool/base.py", line 767, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/pool/base.py", line 425, in checkout
rec = pool._do_get()
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/pool/impl.py", line 256, in _do_get
return self._create_connection()
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/pool/base.py", line 253, in _create_connection
return _ConnectionRecord(self)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/pool/base.py", line 368, in __init__
self.__connect()
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/pool/base.py", line 611, in __connect
pool.logger.debug("Error on connect(): %s", e)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/util/langhelpers.py", line 70, in __exit__
compat.raise_(
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/util/compat.py", line 207, in raise_
raise exception
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/pool/base.py", line 605, in __connect
connection = pool._invoke_creator(self)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/create.py", line 578, in connect
return dialect.connect(*cargs, **cparams)
File "/usr/local/lib/python3.8/dist-packages/sqlalchemy/engine/default.py", line 584, in connect
return self.dbapi.connect(*cargs, **cparams)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) unable to open database file
(Background on this error at: http://sqlalche.me/e/14/e3q8)
```

**Edit :** Add PVC and PV description below

```shell
$ kubectl describe pv
Name: ovh-managed-kubernetes-8tk3qj-pvc-bacb4137-67a9-437f-a047-f561751920c9
Labels:
Annotations: pv.kubernetes.io/provisioned-by: cinder.csi.openstack.org
Finalizers: [kubernetes.io/pv-protection external-attacher/cinder-csi-openstack-org]
StorageClass: csi-cinder-high-speed
Status: Bound
Claim: skl-jhub/hub-db-dir
Reclaim Policy: Delete
Access Modes: RWO
VolumeMode: Filesystem
Capacity: 1Gi
Node Affinity:
Message:
Source:
Type: CSI (a Container Storage Interface (CSI) volume source)
Driver: cinder.csi.openstack.org
FSType:
VolumeHandle: a31dd08e-80a8-4ca8-91ab-7be7295b274e
ReadOnly: false
VolumeAttributes: storage.kubernetes.io/csiProvisionerIdentity=1639470543810-8081-cinder.csi.openstack.org
Events:
```
```shell
$ kubectl describe pvc
Name: hub-db-dir
Namespace: skl-jhub
StorageClass: csi-cinder-high-speed
Status: Bound
Volume: ovh-managed-kubernetes-8tk3qj-pvc-bacb4137-67a9-437f-a047-f561751920c9
Labels: app=jupyterhub
app.kubernetes.io/managed-by=Helm
chart=jupyterhub-1.2.0
component=hub
heritage=Helm
release=skl-jhub
Annotations: meta.helm.sh/release-name: skl-jhub
meta.helm.sh/release-namespace: skl-jhub
pv.kubernetes.io/bind-completed: yes
pv.kubernetes.io/bound-by-controller: yes
volume.beta.kubernetes.io/storage-provisioner: cinder.csi.openstack.org
Finalizers: [kubernetes.io/pvc-protection]
Capacity: 1Gi
Access Modes: RWO
VolumeMode: Filesystem
Used By: hub-55c56748d6-dfljt
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ExternalProvisioning 26m persistentvolume-controller waiting for a volume to be created, either by external provisioner "cinder.csi.openstack.org" or manually created by system administrator
Normal Provisioning 26m cinder.csi.openstack.org_csi-cinder-controllerplugin-0_f7428e10-cc91-4341-92c5-eaae61679ebc External provisioner is provisioning volume for claim "skl-jhub/hub-db-dir"
Normal ProvisioningSucceeded 26m cinder.csi.openstack.org_csi-cinder-controllerplugin-0_f7428e10-cc91-4341-92c5-eaae61679ebc Successfully provisioned volume ovh-managed-kubernetes-8tk3qj-pvc-bacb4137-67a9-437f-a047-f561751920c9
```

This is definitely a permissions issue since it works when I set the pod user as root but I cannot do that in prod. The default userId/groupId for Jupyterhib is `1000` so the mounted PV should set the rights accordingly.

Any idea on how to achieve that ?