Add custom attribute support to the article spider.

[wRAR]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.90%. Comparing base (3f0a47c) to head (19065d4).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
zyte_spider_templates/spiders/article.py	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
+ Coverage   95.36%   95.90%   +0.53%     
==========================================
  Files          26       26              
  Lines        2609     2610       +1     
==========================================
+ Hits         2488     2503      +15     
+ Misses        121      107      -14     

Files with missing lines	Coverage Δ
zyte_spider_templates/spiders/article.py	85.97% <83.33%> (+0.08%)	⬆️

... and 3 files with indirect coverage changes