Use GitHub pages gem

[anssiko]

This helps maintain a Jekyll build environment that matches the GH Pages build environment.

@ibelem, can you please check this works on your system following the updated instruction in README.

I tested this locally on Jekyll 4.4.1 and it worked on my system.

I incorporated Gemfile.lock changes in a separate commit so you can also try to update dependencies yourself by checking out HEAD~1 and running:

bundle install

[ibelem]

@anssiko Thanks for updating the build environment, I tested your PR and no build errors found. 👍 Please merge this PR.

belem@int:~/github/webmachinelearning.github.io$ git fetch upstream pull/96/head:github-pages-gem
From https://github.com/webmachinelearning/webmachinelearning.github.io
 * [new ref]         refs/pull/96/head -> github-pages-gem
belem@int:~/github/webmachinelearning.github.io$ git checkout github-pages-gem 
Switched to branch 'github-pages-gem'
belem@int:~/github/webmachinelearning.github.io$ git log
commit 2ab0db783df8b68a119f0b0e6c95003118901002 (HEAD -> github-pages-gem, upstream/github-pages-gem)
Author: Anssi Kostiainen <anssi.kostiainen@gmail.com>
Date:   Fri Oct 17 12:31:41 2025 +0300

    Update Gemfile.lock
    
    Update dependencies with:
    bundle install

commit 13d5e93d32aff8d8738a17f6d4117f4fe4e0b69e
Author: Anssi Kostiainen <anssi.kostiainen@gmail.com>
Date:   Fri Oct 17 12:11:49 2025 +0300

    Use github-pages gem
    
    This helps maintain a Jekyll build environment that matches the GH Pages build environment.
    
    Tested locally with Jekyll 4.4.1 (version requirement remains commented out in Gemfile).
belem@int:~/github/webmachinelearning.github.io$ bundle install
Fetching gem metadata from https://rubygems.org/.........
Using concurrent-ruby 1.1.8
Using public_suffix 4.0.6
Using bundler 2.3.26
Using colorator 1.1.0
Fetching simpleidn 0.2.3
Fetching minitest 5.26.0
Fetching benchmark 0.4.1
Fetching mutex_m 0.3.0
Fetching securerandom 0.4.1
Using eventmachine 1.2.7
Using ffi 1.15.0
Using http_parser.rb 0.6.0
Fetching json 2.15.1
Fetching commonmarker 0.23.12
Fetching execjs 2.10.0
Fetching logger 1.7.0
Fetching uri 1.0.4
Fetching drb 2.2.3
Fetching connection_pool 2.5.4
Fetching base64 0.3.0
Fetching coffee-script-source 1.12.2
Fetching csv 3.3.5
Fetching bigdecimal 3.3.1
Installing mutex_m 0.3.0
Installing base64 0.3.0
Installing securerandom 0.4.1
Using forwardable-extended 2.6.0
Fetching gemoji 4.1.0
Using rexml 3.2.5
Using liquid 4.0.4
Using rb-fsevent 0.10.4
Fetching rouge 3.30.0
Installing connection_pool 2.5.4
Fetching mercenary 0.3.6
Installing logger 1.7.0
Installing benchmark 0.4.1
Using safe_yaml 1.0.5
Fetching webrick 1.9.1
Using racc 1.7.3
Fetching jekyll-paginate 1.1.0
Fetching rubyzip 2.4.1
Installing execjs 2.10.0
Fetching jekyll-swiss 1.0.0
Installing drb 2.2.3
Using unicode-display_width 1.7.0
Using addressable 2.8.0
Using i18n 1.8.10
Fetching tzinfo 2.0.6
Installing uri 1.0.4
Using em-websocket 0.5.2
Fetching ethon 0.15.0
Installing coffee-script-source 1.12.2
Using rb-inotify 0.10.1
Using pathutil 0.16.2
Using kramdown 2.4.0
Using nokogiri 1.16.5 (x86_64-linux)
Fetching terminal-table 1.8.0
Installing csv 3.3.5
Fetching net-http 0.6.0
Installing json 2.15.1 with native extensions
Installing minitest 5.26.0
Fetching coffee-script 2.4.1
Installing simpleidn 0.2.3
Installing commonmarker 0.23.12 with native extensions
Fetching sass-listen 4.0.0
Installing mercenary 0.3.6
Installing jekyll-paginate 1.1.0
Installing bigdecimal 3.3.1 with native extensions
Using listen 3.5.1
Using kramdown-parser-gfm 1.1.0
Fetching dnsruby 1.73.0
Using jekyll-watch 2.2.1
Installing jekyll-swiss 1.0.0
Installing gemoji 4.1.0
Installing rubyzip 2.4.1
Installing terminal-table 1.8.0
Installing coffee-script 2.4.1
Fetching jekyll-coffeescript 1.2.2
Installing webrick 1.9.1
Installing tzinfo 2.0.6
Installing ethon 0.15.0
Fetching typhoeus 1.5.0
Installing net-http 0.6.0
Fetching faraday-net_http 3.4.1
Installing sass-listen 4.0.0
Fetching sass 3.7.4
Installing rouge 3.30.0
Installing jekyll-coffeescript 1.2.2
Installing faraday-net_http 3.4.1
Installing dnsruby 1.73.0
Installing typhoeus 1.5.0
Installing sass 3.7.4
Fetching jekyll-sass-converter 1.5.2
Installing jekyll-sass-converter 1.5.2
Fetching jekyll 3.10.0
Fetching faraday 2.14.0
Installing jekyll 3.10.0
Fetching jekyll-default-layout 0.1.5
Fetching jekyll-feed 0.17.0
Fetching jekyll-include-cache 0.2.1
Fetching jekyll-optional-front-matter 0.3.2
Fetching jekyll-remote-theme 0.4.3
Fetching jekyll-seo-tag 2.8.0
Fetching jekyll-titles-from-headings 0.5.3
Fetching jekyll-readme-index 0.3.0
Fetching jekyll-redirect-from 0.16.0
Fetching jekyll-relative-links 0.6.1
Fetching jekyll-sitemap 1.4.0
Fetching jekyll-avatar 0.8.0
Fetching jekyll-toc 0.19.0
Installing faraday 2.14.0
Fetching sawyer 0.9.2
Installing jekyll-optional-front-matter 0.3.2
Installing jekyll-relative-links 0.6.1
Installing jekyll-readme-index 0.3.0
Installing jekyll-feed 0.17.0
Installing jekyll-avatar 0.8.0
Installing jekyll-default-layout 0.1.5
Installing jekyll-include-cache 0.2.1
Installing jekyll-remote-theme 0.4.3
Installing jekyll-titles-from-headings 0.5.3
Installing jekyll-toc 0.19.0
Installing jekyll-redirect-from 0.16.0
Fetching activesupport 7.1.5.2
Installing jekyll-seo-tag 2.8.0
Fetching jekyll-theme-architect 0.2.0
Fetching jekyll-theme-cayman 0.2.0
Fetching jekyll-theme-dinky 0.2.0
Fetching jekyll-theme-hacker 0.2.0
Fetching jekyll-theme-leap-day 0.2.0
Fetching jekyll-theme-merlot 0.2.0
Fetching jekyll-theme-midnight 0.2.0
Fetching jekyll-theme-minimal 0.2.0
Fetching jekyll-theme-modernist 0.2.0
Fetching jekyll-theme-slate 0.2.0
Fetching jekyll-theme-tactile 0.2.0
Fetching jekyll-theme-time-machine 0.2.0
Installing sawyer 0.9.2
Using minima 2.5.1
Fetching octokit 4.25.1
Installing jekyll-sitemap 1.4.0
Fetching jekyll-commonmark 1.4.0
Installing jekyll-theme-modernist 0.2.0
Installing jekyll-theme-cayman 0.2.0
Installing jekyll-theme-dinky 0.2.0
Installing jekyll-theme-hacker 0.2.0
Installing jekyll-theme-time-machine 0.2.0
Installing jekyll-theme-slate 0.2.0
Installing jekyll-theme-tactile 0.2.0
Installing jekyll-theme-architect 0.2.0
Installing octokit 4.25.1
Fetching jekyll-gist 1.5.0
Fetching jekyll-github-metadata 2.16.1
Fetching github-pages-health-check 1.18.2
Installing jekyll-commonmark 1.4.0
Fetching jekyll-commonmark-ghpages 0.5.1
Installing activesupport 7.1.5.2
Fetching html-pipeline 2.14.3
Installing jekyll-theme-minimal 0.2.0
Installing jekyll-theme-merlot 0.2.0
Installing jekyll-theme-leap-day 0.2.0
Installing jekyll-theme-midnight 0.2.0
Installing jekyll-gist 1.5.0
Installing jekyll-github-metadata 2.16.1
Fetching jekyll-theme-primer 0.6.0
Installing jekyll-commonmark-ghpages 0.5.1
Installing github-pages-health-check 1.18.2
Installing html-pipeline 2.14.3
Fetching jekyll-mentions 1.6.0
Fetching jemoji 0.13.0
Installing jekyll-theme-primer 0.6.0
Installing jemoji 0.13.0
Installing jekyll-mentions 1.6.0
Fetching github-pages 232
Installing github-pages 232
Bundle complete! 8 Gemfile dependencies, 100 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
Post-install message from dnsruby:
Installing dnsruby...
  For issues and source code: https://github.com/alexdalitz/dnsruby
  For general discussion (please tell us how you use dnsruby): https://groups.google.com/forum/#!forum/dnsruby
Post-install message from sass:

Ruby Sass has reached end-of-life and should no longer be used.

* If you use Sass as a command-line tool, we recommend using Dart Sass, the new
  primary implementation: https://sass-lang.com/install

* If you use Sass as a plug-in for a Ruby web framework, we recommend using the
  sassc gem: https://github.com/sass/sassc-ruby#readme

* For more details, please refer to the Sass blog:
  https://sass-lang.com/blog/posts/7828841

Post-install message from html-pipeline:
-------------------------------------------------
Thank you for installing html-pipeline!
You must bundle Filter gem dependencies.
See html-pipeline README.md for more details.
https://github.com/jch/html-pipeline#dependencies
-------------------------------------------------
Post-install message from rubyzip:
RubyZip 3.0 is coming!
**********************

The public API of some Rubyzip classes has been modernized to use named
parameters for optional arguments. Please check your usage of the
following classes:
  * `Zip::File`
  * `Zip::Entry`
  * `Zip::InputStream`
  * `Zip::OutputStream`
  * `Zip::DOSTime`

Run your test suite with the `RUBYZIP_V3_API_WARN` environment
variable set to see warnings about usage of the old API. This will
help you to identify any changes that you need to make to your code.
See https://github.com/rubyzip/rubyzip/wiki/Updating-to-version-3.x for
more information.

Please ensure that your Gemfiles and .gemspecs are suitably restrictive
to avoid an unexpected breakage when 3.0 is released (e.g. ~> 2.3.0).
See https://github.com/rubyzip/rubyzip for details. The Changelog also
lists other enhancements and bugfixes that have been implemented since
version 2.3.0.
belem@int:~/github/webmachinelearning.github.io$ bundle exec jekyll serve
Configuration file: /home/belem/github/webmachinelearning.github.io/_config.yml
To use retry middleware with Faraday v2.0+, install `faraday-retry` gem
            Source: /home/belem/github/webmachinelearning.github.io
       Destination: /home/belem/github/webmachinelearning.github.io/_site
 Incremental build: disabled. Enable with --incremental
      Generating... 
       Jekyll Feed: Generating feed for posts
                    done in 0.742 seconds.
 Auto-regeneration: enabled for '/home/belem/github/webmachinelearning.github.io'
    Server address: http://0.0.0.0:4000/
  Server running... press ctrl-c to stop.