Fix values for Minio security context

General MR

Summary

Changes based off nightly CI failures - looks like this needed an update to match the defaults at the package level - https://repo1.dso.mil/big-bang/product/packages/minio/-/blob/main/chart/values.yaml#L141-150

added mattermost minio labels

assigned to @micah.nagel

added statusreview label

approved this merge request

Upgrade failure is not critical in this case due to all changes being CI values. Going to push this through to see if it resolved nightly failures.

merged

mentioned in commit a19a324b