RFR: 8375054: Removed "signed" property from jpackage app image file

[Alexander Matveev]

On Mon, 12 Jan 2026 17:08:17 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> $subj
> 
> Additionally:
>  - Validate that the value of the "--app-image" option on macOS is a valid macOS bundle, and if it is not, exit with a new "error.parameter-not-mac-bundle" error.
>  - Read stdout of "/usr/bin/codesign" and "/usr/sbin/spctl" commands outputing plist XML as binary, and not as text.

Looks good.

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Marked as reviewed by almatvee (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29173#pullrequestreview-3653374025