Add docker with cgroup2 detection #253

Job	Run time
rubocop	25s
test (2.3, rails-5.2.gemfile)	1m 0s
test (2.4, rails-5.2.gemfile)	1m 2s
test (2.5, rails-5.2.gemfile)	37s
test (2.5, rails-6.0.gemfile)	1m 10s
test (2.5, rails-6.1.gemfile)	48s
test (2.6, rails-5.2.gemfile)	57s
test (2.6, rails-6.0.gemfile)	51s
test (2.6, rails-6.1.gemfile)	40s
test (2.7, rails-5.2.gemfile)	47s
test (2.7, rails-6.0.gemfile)	43s
test (2.7, rails-6.1.gemfile)	41s
test (2.7, rails-7.0.gemfile)	41s
test (3.0, rails-6.0.gemfile)	25s
test (3.0, rails-6.1.gemfile)	30s
test (3.0, rails-7.0.gemfile)	25s
test (3.1, rails-6.0.gemfile)	28s
test (3.1, rails-6.1.gemfile)	50s
test (3.1, rails-7.0.gemfile)	24s
test (3.1, rails-main.gemfile)	46s
test (3.2, rails-6.0.gemfile)	24s
test (3.2, rails-6.1.gemfile)	26s
test (3.2, rails-7.0.gemfile)	28s
test (3.2, rails-main.gemfile)	33s
test (3.3, rails-6.0.gemfile)	30s
test (3.3, rails-6.1.gemfile)	26s
test (3.3, rails-7.0.gemfile)	19s
test (3.3, rails-main.gemfile)	29s
test (jruby-9.1, rails-5.2.gemfile)	53s
test (jruby-9.2, rails-5.2.gemfile)	1m 8s
test (jruby-9.2, rails-6.0.gemfile)	2m 44s
test (jruby-9.2, rails-6.1.gemfile)	56s
test (jruby-9.3, rails-5.2.gemfile)	57s
test (jruby-9.3, rails-6.0.gemfile)	48s
test (jruby-9.3, rails-6.1.gemfile)	52s
test (jruby-9.4, rails-6.0.gemfile)	49s
test (jruby-9.4, rails-6.1.gemfile)	44s
test (jruby-9.4, rails-7.0.gemfile)	46s
test (jruby-9.4, rails-main.gemfile)	1m 22s
	29m 44s

Provide feedback