RFR: 1690: Make jcheck cli able to use conf from workspace or other commit [v3]

[Zhao Song]

On Wed, 30 Nov 2022 19:50:56 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> I'd be more worried about what it might do to my current index or working tree. Is there any chance things could go badly and mess that up?

No, I believe under any condition it won't do anything to your index or working tree.

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PR: https://git.openjdk.org/skara/pull/1428