Add RSA Key Automation System #309

[7476ZHAO]

Automated RSA key management system for Linux servers.
Adds cron-based SSH key expiry, cleanup, and metadata consistency handling (tested on GCP, deployed on standalone Linux).

[3C-SCSU]

No code conflict.

[3C-SCSU]

There are problems with the code submitted. Get in touch for more details.

[7476ZHAO]

There are problems with the code submitted. Get in touch for more details.

Dr. C, thank you for reminder. This problem occurs probably because GitHub Actions runners are hosted on Azure; when installing the filelock module, Ubuntu’s package manager automatically used the Azure mirror (azure.archive.ubuntu.com) for faster download, not because the code relies on Azure. I substituted filelock module with fcntl, tested again and commited again. Please try workflow one more. Thanks.

[3C-SCSU]

Code approval process -- 3 Steps review:
(1) Yes; (2) Maybe; (3) No; > {total lines changed - add/delete} [Reasoning]
example - feedback >> (2) > {341} [ Code needs to explain what it does ]

• Reviewer: @Esma-Ali - feedback >> () > [ ]
• Reviewer: @FatedZenith - feedback >> () > [ ]
• Reviewer: @Shariq80 - feedback >> () > [ ]

[3C-SCSU]

Please ensure you've updated the Avatar code base with the latest changes from the rebased repository. After verifying consistency and confirming that your forked account and local clone are running the most current version, you can then resubmit the pull request.