Fails to build with Ruby3.0. | Lock to Ruby2.7

[hinell]

# Gemfile
ruby "~>2.7"
...
gem 'nokogiri', '~> 1.11.2'
...

Why not to use Jekyll? I'm trying to build the learnxinyminutes-site by using Ruby3.0 and it fails due to differences in standard lib that is used by middleman deps.

Expected

• Effortless & fast build

Actual behavior

• A lot of incompatibility errors
• Wasted over 2 hours to just to figure out that I have to downgrade ruby & bundler and install all deps

Steps to reproduce

1. Run Debian/[K]Ubuntu 22.04.2
2. Install Ruby3.0
3. Follow instructions at learnxinyminutes/CONTRIBUTING.markdown
4. Fails to build website

Additional information

• Ruby version: 3.0
• Middleman version: 3.3
• OS version: [K]Ubuntu 22.04.2 LTS

Workaround

On Linux/Ubuntu systems with fresh updates you have to install ruby2.7 anyway:

sudo apt install ruby2.7 ruby2.7-dev

Update your Gemfile. Update nokogiri. See related PR nokogiri#2106

# Gemfile
source 'http://rubygems.org'

ruby "~>2.7"

gem "rouge"
gem "pygments.rb"
gem "middleman", "~>3.4.0"
gem "middleman-syntax", "~>3.3.0"
gem "redcarpet", "2.3.0"

gem "haml", "~>4.0.5"

# For feed.xml.builder
gem "builder", "~> 3.0.0"

# Github security recommendations
gem 'yajl-ruby', '~> 1.3.1'
gem 'nokogiri', '~> 1.11.2' 

In your shell, run:

  sudo gem2.7 install  bundler -v '1.17.3'
  sudo bundle2.7 install
  bundle2.7 exec middleman

Note: The last command may leak memory somehow.

[nopeless]

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