allow recursive search with glob pattern

[vuillaut]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.49%. Comparing base (4f7ed59) to head (4e0ab08).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
lstchain/scripts/lstchain_merge_muon_files.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1286   +/-   ##
=======================================
  Coverage   73.49%   73.49%           
=======================================
  Files         134      134           
  Lines       14210    14210           
=======================================
  Hits        10443    10443           
  Misses       3767     3767           

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