Resolves mkdir permissions issue for jsonnet libraries

[vosmax]

Description

During importing jsonnet libraries from config maps by the operator, Permission access error occurs because of limited permission of the run user

2022-04-09T09:02:25.894Z	ERROR	grafana-controller	error creating jsonnet library directory for jsonnet-libs	{"error": "mkdir /opt/jsonnet/my-jsonnet-libs: permission denied"}

Type of change

Bug fix (non-breaking change which fixes an issue)

Checklist

• This change requires a documentation update
• I have added tests that prove my fix is effective or that my feature works
• I have added a test case that will be used to verify my changes
• Verified independently on a cluster by reviewer

Verification steps

To reproduce locally

~ docker run --entrypoint "ls" -u root quay.io/grafana-operator/grafana-operator:v4.2.0 "-lah" "/opt/jsonnet"
total 12K
drwxr-xr-x 1 nobody root 4.0K Feb 22 15:34 .
drwxr-xr-x 1 root   root 4.0K Feb 22 15:34 ..
drwxr-xr-x 2 root   root 4.0K Feb 22 15:34 grafonnet

~ docker run --entrypoint "cat" -u root quay.io/grafana-operator/grafana-operator:v4.2.0 "/etc/passwd"
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:65534:65534:Kernel Overflow User:/:/sbin/nologin


~ docker run --entrypoint "mkdir"  quay.io/grafana-operator/grafana-operator:v4.2.0 "/opt/jsonnet/jsonnet-libs" 
mkdir: cannot create directory '/opt/jsonnet/jsonnet-libs': Permission denied

~ docker run --entrypoint "mkdir" -u nobody quay.io/grafana-operator/grafana-operator:v4.2.0 "/opt/jsonnet/jsonnet-libs"
~ 

To test on k8s cluster
Add to deployment securityContext

    spec:
      securityContext:
        runAsUser: 65534

[NissesSenap]

@HubertStefanski can you verify if this work as intended on OCP?

[HVBE]

@NissesSenap Sure, I only noticed your comment today, sorry about that! taking a look 👀