allow other urls not starting with http

[mirpedrol]

Close #2006

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #2061 (f20e34d) into dev (fff7bea) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #2061      +/-   ##
==========================================
- Coverage   67.63%   67.60%   -0.04%     
==========================================
  Files          43       43              
  Lines        5584     5584              
==========================================
- Hits         3777     3775       -2     
- Misses       1807     1809       +2     

Impacted Files	Coverage Δ
nf_core/modules/test_yml_builder.py	48.63% <0.00%> (-0.91%)	⬇️

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