fix: file mode when type: tree

[caarlos0]

closes #777

[cloudflare-workers-and-pages]

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Latest commit:	4c2aafc
Status:	✅  Deploy successful!
Preview URL:	https://db2c60d3.nfpm.pages.dev
Branch Preview URL:	https://fix-perms.nfpm.pages.dev

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e1ebfda) 75.15% compared to head (4c2aafc) 75.18%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #779      +/-   ##
==========================================
+ Coverage   75.15%   75.18%   +0.03%     
==========================================
  Files          13       13              
  Lines        2475     2478       +3     
==========================================
+ Hits         1860     1863       +3     
  Misses        435      435              
  Partials      180      180              

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