Document Badger file permissions as non-root service.

[yurishkuro]

Solution is described here: jaegertracing/jaeger#4906 (comment)

This can go to an .md file in jaeger repo inside Badger directory and linked from the docs https://www.jaegertracing.io/docs/1.55/deployment/#badger---local-storage

[tico88612]

PR has been opened at jaeger repo.
Please feel free to take a look at it.