update build to work with Ubuntu 22.04

[sel4]

update build to work with Ubuntu 22.04

[Ivan-Velickovic]

What's weird is that the Docker container on Ubuntu 22.04 doesn't seem to work for me, can't tell if it's something else or because of Ubuntu 22.04:

  Dependency Error: Yikes! It looks like you don't have /docs/_plugins/breadcrumbs.rb or one of its dependencies installed. In order to use Jekyll as currently configured, you'll need to install this gem. If you've run Jekyll with `bundle exec`, ensure that you have included the /docs/_plugins/breadcrumbs.rb gem in your Gemfile as well. The full error message from Ruby is: 'cannot load such file -- /docs/_plugins/breadcrumbs.rb' If you run into trouble, you can find helpful resources at https://jekyllrb.com/help/! 
                    ------------------------------------------------
      Jekyll 4.0.1   Please append `--trace` to the `build` command 
                     for any additional information or backtrace. 
                    ------------------------------------------------
Traceback (most recent call last):
	38: from /usr/local/bin/bundle:23:in `<main>'
	37: from /usr/local/bin/bundle:23:in `load'
	36: from /usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:34:in `<top (required)>'
	35: from /usr/local/lib/ruby/2.7.0/bundler/friendly_errors.rb:123:in `with_friendly_errors'
	34: from /usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:46:in `block in <top (required)>'
	33: from /usr/local/lib/ruby/2.7.0/bundler/cli.rb:24:in `start'
	32: from /usr/local/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/base.rb:476:in `start'
	31: from /usr/local/lib/ruby/2.7.0/bundler/cli.rb:30:in `dispatch'
	30: from /usr/local/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor.rb:399:in `dispatch'
	29: from /usr/local/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
	28: from /usr/local/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
	27: from /usr/local/lib/ruby/2.7.0/bundler/cli.rb:476:in `exec'
	26: from /usr/local/lib/ruby/2.7.0/bundler/cli/exec.rb:28:in `run'
	25: from /usr/local/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `kernel_load'
	24: from /usr/local/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `load'
	23: from /usr/local/bundle/bin/jekyll:23:in `<top (required)>'
	22: from /usr/local/bundle/bin/jekyll:23:in `load'
	21: from /usr/local/bundle/gems/jekyll-4.0.1/exe/jekyll:15:in `<top (required)>'
	20: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary.rb:19:in `program'
	19: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/program.rb:42:in `go'
	18: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `execute'
	17: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `each'
	16: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `block in execute'
	15: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/commands/build.rb:18:in `block (2 levels) in init_with_program'
	14: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/command.rb:89:in `process_with_graceful_fail'
	13: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/command.rb:89:in `each'
	12: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/command.rb:89:in `block in process_with_graceful_fail'
	11: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/commands/build.rb:30:in `process'
	10: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/commands/build.rb:30:in `new'
	 9: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/site.rb:34:in `initialize'
	 8: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/site.rb:124:in `setup'
	 7: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/plugin_manager.rb:21:in `conscientious_require'
	 6: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/plugin_manager.rb:87:in `require_plugin_files'
	 5: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/plugin_manager.rb:87:in `each'
	 4: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/plugin_manager.rb:89:in `block in require_plugin_files'
	 3: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/external.rb:57:in `require_with_graceful_fail'
	 2: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/external.rb:57:in `each'
	 1: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/external.rb:60:in `block in require_with_graceful_fail'
/usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/external.rb:60:in `require': cannot load such file -- /docs/_plugins/breadcrumbs.rb (LoadError)
	38: from /usr/local/bin/bundle:23:in `<main>'
	37: from /usr/local/bin/bundle:23:in `load'
	36: from /usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:34:in `<top (required)>'
	35: from /usr/local/lib/ruby/2.7.0/bundler/friendly_errors.rb:123:in `with_friendly_errors'
	34: from /usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:46:in `block in <top (required)>'
	33: from /usr/local/lib/ruby/2.7.0/bundler/cli.rb:24:in `start'
	32: from /usr/local/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/base.rb:476:in `start'
	31: from /usr/local/lib/ruby/2.7.0/bundler/cli.rb:30:in `dispatch'
	30: from /usr/local/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor.rb:399:in `dispatch'
	29: from /usr/local/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
	28: from /usr/local/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
	27: from /usr/local/lib/ruby/2.7.0/bundler/cli.rb:476:in `exec'
	26: from /usr/local/lib/ruby/2.7.0/bundler/cli/exec.rb:28:in `run'
	25: from /usr/local/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `kernel_load'
	24: from /usr/local/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `load'
	23: from /usr/local/bundle/bin/jekyll:23:in `<top (required)>'
	22: from /usr/local/bundle/bin/jekyll:23:in `load'
	21: from /usr/local/bundle/gems/jekyll-4.0.1/exe/jekyll:15:in `<top (required)>'
	20: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary.rb:19:in `program'
	19: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/program.rb:42:in `go'
	18: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `execute'
	17: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `each'
	16: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `block in execute'
	15: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/commands/build.rb:18:in `block (2 levels) in init_with_program'
	14: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/command.rb:89:in `process_with_graceful_fail'
	13: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/command.rb:89:in `each'
	12: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/command.rb:89:in `block in process_with_graceful_fail'
	11: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/commands/build.rb:30:in `process'
	10: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/commands/build.rb:30:in `new'
	 9: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/site.rb:34:in `initialize'
	 8: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/site.rb:124:in `setup'
	 7: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/plugin_manager.rb:21:in `conscientious_require'
	 6: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/plugin_manager.rb:87:in `require_plugin_files'
	 5: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/plugin_manager.rb:87:in `each'
	 4: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/plugin_manager.rb:89:in `block in require_plugin_files'
	 3: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/external.rb:57:in `require_with_graceful_fail'
	 2: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/external.rb:57:in `each'
	 1: from /usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/external.rb:58:in `block in require_with_graceful_fail'
/usr/local/bundle/gems/jekyll-4.0.1/lib/jekyll/external.rb:73:in `rescue in block in require_with_graceful_fail': /docs/_plugins/breadcrumbs.rb (Jekyll::Errors::MissingDependencyException)
make: *** [Makefile:95: build] Error 1
make: *** [Makefile:83: docker_serve] Error 2