Allow `executable` used on `archive-file` type

[latipun7]

Describe the bug

I don't know this is the intentional or not, so I'm not sure this is bug report or feature request 😅

Since archive-file external type is kind of file type, executable should works too.

To reproduce

• here's my .chezmoiexternal.yml:

  .local/bin/fnm:
      type:  archive-file
      url: {{ template "fnm-download-url" . }}
      path: fnm
      executable: true
      refreshPeriod: 132h

• chezmoi apply -v
• file .local/bin/fnm didn't have executable permission (the original archive file does not have executable permission, that's why I want to set it as executable with executable field).

Expected behavior

Extracted files should have executable permission.

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Tell me if you need more info. Thank you 🙏

[twpayne]

Thanks, good suggestion. This isn't really a bug as the file in the archive did not have the executable bits set, but it's obviously a useful feature to be able to override them. #3102 implements this.

[latipun7]

Thank you very much 🎉