remove key in the same layer

[guptaNswati]

The scanner is still flagging the keys are they are removed in final build but still present in the openssh-server install layer.

Found in internal scan message": "Secret content search analyzer found regexp match in container: file=/etc/ssh/ssh_host_ecdsa_key regexp=PRIV_KEY",

and local scan done with trivy

Report Summary

┌────────────────────────────────────────────────────────────────┬────────┬─────────┐
│                             Target                             │  Type  │ Secrets │
├────────────────────────────────────────────────────────────────┼────────┼─────────┤
│ ghcr.io/nvidia/k8s-samples:nvbandwidth-b9d88f4a (ubuntu 22.04) │ ubuntu │    -    │
├────────────────────────────────────────────────────────────────┼────────┼─────────┤
│ /etc/ssh/ssh_host_ecdsa_key                                    │  text  │    1    │
├────────────────────────────────────────────────────────────────┼────────┼─────────┤
│ /etc/ssh/ssh_host_ed25519_key                                  │  text  │    1    │
├────────────────────────────────────────────────────────────────┼────────┼─────────┤
│ /etc/ssh/ssh_host_rsa_key                                      │  text  │    1    │
└────────────────────────────────────────────────────────────────┴────────┴─────────┘

[copy-pr-bot]

This pull request requires additional validation before any workflows can run on NVIDIA's runners.

Pull request vetters can view their responsibilities here.

Contributors can view more details about this message here.