Incorrect file permission set on file `/etc/pve/ceph.conf` causes `ceph` user could not access the ceph config file in PVE cluster

I'm trying to install radosgw + ceph dashboard in an experimental 3-nodes PVE v8.2.2 cluster with Ceph v18.2.2. Here is a problem I found:

Ceph v18.2.2 introduces a new feature 'Multi-Site' in dashboard, which need access additional 3 types of information (`realm` / `zone` / `zonegroup`). However, this information could not be retrieved via standardized S3 API, so the ceph developer choose to invoke `radosgw-admin` cli from dashboard (which means ceph-mgr process), to get the required...

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