Add support for changing PVC names

[drinkataco]

This will make it a little easier to manage multiple instances of charts

Description

Please provide a summary of your changes and the chart name and version they pertain to. Include the motivation behind these changes and what issue(s) this PR addresses, if applicable.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Non-breaking change which adds functionality
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have updated the chart version in Chart.yaml according to semantic versioning.
• I have included any new or changed values in the values.yaml file and documented them in the README if applicable.
• My changes are tested and proven to work.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.

Testing

Please describe the tests that you ran to verify your changes. Provide instructions so reviewers can reproduce the testing. Also, list any relevant details for your test configuration.

• Test A
• Test B

Additional Information

Any additional information that you believe is important and relevant to your changes.