Add support for trusted user CA keys and authorized principals in OpenSSH config

[tg123]

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• I have read the contributing guideline and understand that I have made the correct modifications

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Description:

Add support for trusted user CA keys and authorized principals in OpenSSH config

Benefits of this PR and context:

Add new secure way for ssh keys using CA

How Has This Been Tested?

YES

tested locally

Source / References:

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amd64-9.7_p1-r4-pkg-4908cfe5-dev-9bad6f7ab5350f433539c920bdc7259b6a00680c-pr-92	✅
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https://ci-tests.linuxserver.io/lspipepr/openssh-server/9.7_p1-r4-pkg-4908cfe5-dev-a5b6122a975b819b87aec2f842bb974e80abb01d-pr-92/shellcheck-result.xml

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[LinuxServer-CI]

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amd64-9.7_p1-r4-pkg-9ceb4421-dev-dd8ef41c2965b13bdc89fe08414ca2a9f74679fd-pr-92	✅
arm64v8-9.7_p1-r4-pkg-9ceb4421-dev-dd8ef41c2965b13bdc89fe08414ca2a9f74679fd-pr-92	✅

[aptalca]

Thanks for the PR, but this is way too many env vars added for such a niche feature.

Users can easily add this manually as all the necessary files reside in the bind mounted config folder.

Each new env var added increases the setup complexity and thus the barrier of entry, and significantly increases the support burden for our team. I'm afraid this PR has a too high cost to benefit ratio.

[tg123]

all _FILE and ADD_DEFAULT can be removed

what about adding 2 env?