RFR: 1357: Add Oracle copyright header format check to jcheck

[Joe Darcy]

On Thu, 5 Dec 2024 22:43:08 GMT, Zhao Song <zsong at openjdk.org> wrote:

> This patch introduces a copyright jcheck.
> For pull requests, the check checks the copyright header in all modified files(if the file name matches the regex in .jcheck/conf)

>From looking over the logic, I think some additional accommodations will be needed, at least for update trains. For example, if a patch from a feature release authored in 2022 is backported unchanged to an update release, the affected files should have a copyright year end date of 2022 and *not* 2024.

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PR Comment: https://git.openjdk.org/skara/pull/1702#issuecomment-2521701094