--extra-resource does not accept directories or wildcards anymore

[TimoKunze]

Preflight Checklist

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• I have searched the issue tracker for a bug that matches the one I want to file, without success.

Issue Details

• Electron Packager Version:
  • 19.0.1
• Electron Version:
  • 38.3.0
• Operating System:
  • Windows 11 (24H2)
• Last Known Working Electron Packager version::
  • 18.4.4

Expected Behavior

If the value passed to --extra-resource parameter is a directory instead of a file, the whole directory is copied.

Actual Behavior

If the value passed to --extra-resource parameter (e.g. --extra-resource=out/config) is a directory instead of a file, the command fails with:
Path is a directory: cp returned EISDIR (out/config is a directory (not copied)) out/config

To Reproduce

• Take any project that you package using electron-packager.
• Add a directory out/config with some files and sub-directories.
• Add --extra-resource=out/config to your call of electron-packager.

Additional Information

If we're talking about a low and fixed number of files to copy, it's not a problem to specify --extra-resource for each file individually. But in my case it's a variable number of files and it can easily be several dozen.

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