The sitemap.xml requires absolute URLs in <loc> tags

[antwertinger]

What is this pull request for?

show_alchemy_page_url was returning only a path (e.g. /) instead of an absolute URL (e.g. https://www.example.com/). The sitemap protocol requires absolute URLs in tags — relative paths cause the sitemap to be invalid.

The root cause: url_for with a string argument returns the string as-is in Rails and does not prepend protocol or host. Fixed by using request.base_url to build the absolute URL.

Notable changes (remove if none)

show_alchemy_page_url now correctly returns an absolute URL including protocol and host. Specs updated accordingly.

Checklist

• I have followed Pull Request guidelines
• I have added a detailed description into each commit message
• I have added tests to cover this change

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.46%. Comparing base (93033dc) to head (3829a4c).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3753   +/-   ##
=======================================
  Coverage   97.46%   97.46%           
=======================================
  Files         317      317           
  Lines        8431     8431           
=======================================
  Hits         8217     8217           
  Misses        214      214           

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