Allow that users set the file names in ecmwf.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.89%. Comparing base (ba7c9d0) to head (97d8505).

Files with missing lines	Patch %	Lines
src/extras/weather.jl	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1732      +/-   ##
==========================================
+ Coverage   85.83%   85.89%   +0.06%     
==========================================
  Files         167      167              
  Lines       23720    23727       +7     
==========================================
+ Hits        20360    20381      +21     
+ Misses       3360     3346      -14     

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