Permission issue of data-prep container image in helm chart

[LeiZhou-97]

When I try to upload the doc that contains the image, the data-prep pod needs to makedir /img. But under current deployment securitycontext, it will cause permissiondenied.

[lianhao]

Currently, we're hitting another blocking issue opea-project/GenAIComps#398 in data-prep. We need to wait for that issue to be resolved so we can continue debug this.

[lianhao]

I've confirmed that this is an issue in GenAIComps, and is not related to any K8S securityContext. This is reproducible in docker environment too. Please see issue opea-project/GenAIComps#407

[lianhao]

I'm close this issue here, since it's an issue belonging to GenAIComps and is being tracked there