RFR: 8286850: [macos] Add support for signing user provided app image [v2]

[Alexander Matveev]

On Fri, 3 Jun 2022 01:56:01 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

>> - Added support for signing predefined application image.
>>  - Following command can be used to sign predefined application images: jpackage --type app-image --app-image Test.app --mac-sign [additional signing options]
>>  - Main class and if --mac-app-store was specified will be saved in .jpackage.xml. Both values are required for signing. Main class is to generate default identity and --mac-app-store to do correct signing for App Store.
>>  - Signing is done exactly same as when generating app bundle. Unsigned, signed or partially signed app images are supported. App image will be completely unsigned before signing.
>
> Alexander Matveev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8286850: [macos] Add support for signing user provided app image [v2]

8286850: [macos] Add support for signing user provided app image [v2]
 - Fixed all comments from Alexey.
8286850: [macos] Add support for signing user provided app image [v3]
 - Fixed whitespace issues.

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PR: https://git.openjdk.java.net/jdk/pull/8987