Allow to download files to a temp dir first

[crazy-max]

Closes #76

[codecov]

Codecov Report

Merging #149 (76f63f9) into master (3389b51) will increase coverage by 0.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
+ Coverage   63.46%   63.80%   +0.34%     
==========================================
  Files          10       10              
  Lines         104      105       +1     
==========================================
+ Hits           66       67       +1     
  Misses         27       27              
  Partials       11       11              

Impacted Files	Coverage Δ
internal/config/download.go	72.72% <100.00%> (+2.72%)	⬆️

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