[Proposal] add yurtadm proposal

[windydayc]

What type of PR is this?

/kind feature /kind design

What this PR does / why we need it:

Related issue #856

Special notes for your reviewer:

/assign @rambohe-ch /assign @Peeknut

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In response to this:

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line: /kind bug /kind documentation /kind enhancement /kind good-first-issue /kind feature /kind question /kind design /sig ai /sig iot /sig network /sig storage /sig storage

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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Codecov Report

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[rambohe-ch]

@windydayc because sealer can not support render openyurt version info into kubefile, so it's not convenient to build OpenYurt cluster image in a github action pipeline.

and we need to follow the sealer progress, then we can add a new pipeline when sealer supports it. so i will close this proposal now.