Add configuration for adding required gems programmatically

I wasn't able to make adding the dependencies programmatically. I think it does not work because Jekyll needs to be told which gems are required before the generation starts. With the plugins being declared in _config.yml, the following line exists in the log:

Pagination: Complete, processed 1 pagination page(s)

Without the plugin being declared, the line is missing from the log.

That's the code I have tried:

if site.config["gems"].nil? || site.config["gems"].empty?
	site.config["gems"] = ["jekyll-include-cache", "jekyll-paginate-v2"]
else
	if not site.config["gems"].include? 'jekyll-paginate-v2'
		site.config["gems"].unshift("jekyll-paginate-v2")
	end
	if not site.config["gems"].include? 'jekyll-include-cache'
		site.config["gems"].unshift("jekyll-include-cache")
	end
end

As a workaround I'll open a MR to the readme saying they need to be declared.