Add support for OCI Store backed by PVC

[akashsinghal]

What would you like to be added?

Update chart to support PVC creation depending on context (OSS, Azure, AWS, etc). This PVC will mount to the ORAS OCI store path and act as a shared blob cache between Ratify pods. Needed for high availability.

Anything else you would like to add?

No response

Are you willing to submit PRs to contribute to this feature?

• [ ] Yes, I am willing to implement it.