kramdown-parser-gfm missing from Gemfile

[lenicatko]

When trying to run script/cibuild after running script/bootstrap (Fedora 36), the build failed with the following message:

      Generating... 
  Dependency Error: Yikes! It looks like you don't have kramdown-parser-gfm or one of its dependencies installed. In order to use Jekyll as currently configured, you'll need to install this gem. The full error message from Ruby is: 'cannot load such file -- kramdown-parser-gfm' If you run into trouble, you can find helpful resources at https://jekyllrb.com/help/! 
  Conversion error: Jekyll::Converters::Markdown encountered an error while converting 'blog.md':
                    kramdown-parser-gfm
             ERROR: YOUR SITE COULD NOT BE BUILT:
                    ------------------------------------
                    kramdown-parser-gfm

Adding gem "kramdown-parser-gfm" to the Gemfile solves the issue.