[Release-1.25] - cli: k3s fails to execute for users lacking read perms for /etc/rancher/k3s/config.yaml

[dereknola]

Backport fix for cli: k3s fails to execute for users lacking read perms for /etc/rancher/k3s/config.yaml

• cli: k3s fails to execute for users lacking read perms for /etc/rancher/k3s/config.yaml #4321

[est-suse]

Validated on master branch using commit id 4e1ba3a

k3s version v1.25.10+k3s-4e1ba3a0 (4e1ba3a0)
go version go1.19.9

Environment Details
Infrastructure
Cloud EC2 instance

Node(s) CPU architecture, OS, and Version:
Ubuntu 22.04

Cluster Configuration:
Single node

Steps to reproduce from the PR

touch /etc/rancher/k3s/config.yaml
sudo chmod 700 /etc/rancher/k3s/config.yaml
Install k3s
Call k3s --help, k3s --version, k3s -h, k3s server -h

Results from reproduce the issue:

ubuntu@ip-172-1-1-1:~$ k3s --version
FATA[0000] open /etc/rancher/k3s/config.yaml: permission denied 
ubuntu@ip-172-1-1~1$ k3s -v
FATA[0000] open /etc/rancher/k3s/config.yaml: permission denied 
ubuntu@iip-172-1-1-1:~$ k3s --help
FATA[0000] open /etc/rancher/k3s/config.yaml: permission denied 
ubuntu@ip-172-1-1:~$ k3s server -h
FATA[0000] open /etc/rancher/k3s/config.yaml: permission denied 

Results from validation:

 k3s --version
k3s version v1.25.10+k3s-4e1ba3a0 (4e1ba3a0)
go version go1.19.9

 k3s server -h
NAME:
   k3s server - Run management server