Is your feature request related to a problem? Please describe.

Given a config like this:

{
  "auto_auth": {
    "sink": [
      {
        "config": {
          "mode": 256,
          "path": "/run/keys/my-token"
        },
        "type": "file"
      }
    ]
  }
}

Note the 256 is to work around #9404.

The /run/keys/my-token file is deleted and recreated with the owner / group running the Vault agent. This is different from the templating support, which will preserve the owner and group of the existing file.

Describe the solution you'd like

I would like to specify the owner and group of the sink file, or, have the sink preserve the ownership.

Describe alternatives you've considered

Running vault login in a loop to create the file instead.