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Unable to clone with SSH: unprotected private key file

See original GitHub issue

Describe the bug

When attempting to clone a git repository via the terminal, I get the error:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0644 for '/etc/ssh/default-1569588924848/ssh-privatekey' are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
Load key "/etc/ssh/default-1569588924848/ssh-privatekey": bad permissions
Permission denied (publickey).
fatal: Could not read from remote repository.

I can’t change the permissions as Che is injecting this as readonly.

Che version

latest
nightly
other: please specify

Steps to reproduce

Add SSH key with the SSH: generate key pair... command
Restart workspace
Launch terminal for main workspace container
Run git clone {some git@ URL}

Expected behavior

SSH key should be mounted with appropriate permissions (i.e. 400 or 600).

Runtime

kubernetes (include output of kubectl version)
Openshift (include output of oc version)
minikube (include output of minikube version and kubectl version)
minishift (include output of minishift version and oc version)
docker-desktop + K8S (include output of docker version and kubectl version)
other: Rancher

kubectl version
Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.9", GitCommit:"3e4f6a92de5f259ef313ad876bb008897f6a98f0", GitTreeState:"clean", BuildDate:"2019-08-05T09:22:00Z", GoVersion:"go1.11.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.6", GitCommit:"96fac5cd13a5dc064f7d9f4f23030a6aeface6cc", GitTreeState:"clean", BuildDate:"2019-08-19T11:05:16Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}