fix: split yaml by matching (?m)^---\n regex

[joaoestrela]

Fix issues described on #278 and #294

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.66%. Comparing base (08b806c) to head (28c9c8f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   29.58%   29.66%   +0.08%     
==========================================
  Files          23       23              
  Lines        1724     1726       +2     
==========================================
+ Hits          510      512       +2     
  Misses       1137     1137              
  Partials       77       77              

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[hiddeco]

While reviewing this, I wondered why we were not making use of a YAML reader that knows how to properly split documents, which resulted in #315. Nonetheless, I want to thank you for your contribution @joaoestrela. 🙇