Enable binary building on forks

[koppor]

A build at a fork should also provide binaries. This PR enables this. Tried at koppor#660 - and it worked.

macOS contains a folder (JabRef.app) instead of a zip, but I think: better than nothing ^^

Follow-up to #10574

Mandatory checks

• Change in CHANGELOG.md described in a way that is understandable for the average user (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[github-actions]

The build for this PR is no longer available. Please visit https://builds.jabref.org/main/ for the latest build.

[Siedlerchr]

Please zip at least the mac app. The folder does not help and you cannot download it

[Siedlerchr]

I don't like the idea of building binary files for forks. There are so many wip prs that never get finished and Will occupy disk space.

[koppor]

I don't like the idea of building binary files for forks. There are so many wip prs that never get finished and Will occupy disk space.

This PR stores them on GitHub, not at our server. - They are kept on GitHub for 90 days. (See https://docs.github.com/en/organizations/managing-organization-settings/configuring-the-retention-period-for-github-actions-artifacts-and-logs-in-your-organization).

If we want to save space for GitHub, we could change the setting to 3 days?

[koppor]

Please zip at least the mac app. The folder does not help

Didn't we remove the zipping in our build scripts somehow? I forgot :p

and you cannot download it

I don't understand. One can click on "JabRef-macos-latest" and you get that thing containing that folder.

[koppor]

For #10521, I would have needed a binary build to send the binary to MLEP for testing.