RFR: 8346046: Enable copyright header format check

[David Holmes]

On Thu, 12 Dec 2024 19:58:29 GMT, Zhao Song <zsong at openjdk.org> wrote:

> As requested in [SKARA-1357](https://bugs.openjdk.org/browse/SKARA-1357), now skara bot is able to check the copyright header format.
> Now I am going to update the jcheck configuration to configure copyright check as an error.

.jcheck/conf line 39:

> 37: 
> 38: [checks "copyright"]
> 39: files=^(?!LICENSE|license\.txt|.*\.bin|.*\.gif|.*\.jpg|.*\.png|.*\.patch|.*\.wav|.*\.class|.*-header|.*\.jar|).*

IIUC there are other special files that could be excluded here: .icon, .tiff, .dat

But, again IIUC, this is just an optimization as the check would be "if the file has what appears to be an Oracle copyright, then validate the format". So binary files would not have it and so would not be validated.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22721#discussion_r1883255309