dashboard-dev can't update /etc/{passwd,group} on non-root instances.

[monaka]

Description

dashboard-dev container won't work on the Che instances run as non-root.

Reproduction Steps

che_host is set CHE_INFRA_KUBERNETES_POD_SECURITY__CONTEXT_RUN__AS__USER to 1724 (non root)
Spawn workspace from https://che_host/f?url=https://github.com/eclipse/che/blob/master/dashboard/devfile.yaml

OS and version:

Diagnostics:

kubectl logs workspacerxvr82s6mj4vdl3f.dash-dev-5c55598b7b-fwc4m -c dash-dev
/entrypoint.sh: line 22: /etc/passwd: Permission denied
cat: //.passwd.template: No such file or directory
/entrypoint.sh: line 26: /etc/group: Permission denied
cat: //.group.template: No such file or directory

[monaka]

I've not tested yet but some sudo will be required there. https://github.com/eclipse/che/blob/8af9570b50268adf810edea6050d4db9f1a94aa1/dockerfiles/dashboard-dev/src/entrypoint.sh#L20-L26

[monaka]

Sorry for confusing. The crash is caused by the another reason (probably by my env). So I fixed the title and the description on this issue.