feat: rename single file on copy

[ghiscoding]

You can copy and rename a single file by specifying the source file and the destination filename (not just a directory). For example, to copy input/.env_publish to output/.env:

copyfiles input/.env_publish output/.env

This will copy and rename the file in one step.
You can use this for any filename, not just files starting with a dot:

copyfiles input/original.txt output/renamed.txt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5112d35) to head (70910d1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #18   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          208       233   +25     
  Branches        58        68   +10     
=========================================
+ Hits           208       233   +25     

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