Include minimum permissions to run Kong without root

[raylaijh]

Where is the problem?

https://docs.konghq.com/gateway/latest/production/running-kong/kong-user/

What happened?

We should furnish out the minimum permissions to run Kong without root instead of a note which is not conclusive. It is a common security concern for any tools to be run in a production environment.

What did you expect to happen?

List out the minimum permissions to run Kong with the kong user and group

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