fix: handle file not found

[caarlos0]

see discussion in goreleaser/goreleaser#1889 (comment)

[codecov]

Codecov Report

Merging #6 (a383837) into main (95758cf) will increase coverage by 0.37%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   82.60%   82.97%   +0.37%     
==========================================
  Files           2        2              
  Lines          92       94       +2     
==========================================
+ Hits           76       78       +2     
  Misses          9        9              
  Partials        7        7              

Impacted Files	Coverage Δ
glob.go	82.45% <66.66%> (+0.63%)	⬆️
prefix.go	83.78% <92.30%> (ø)

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