Only install debug with CRuby #2929

Job	Run time
ruby-versions / Generate Ruby versions	8s
vterm-yamatanooroti 2.7 (latest reline)	1m 18s
rake test 2.7 (latest reline)	56s
vterm-yamatanooroti 2.7	1m 16s
rake test 2.7	56s
vterm-yamatanooroti 3.0 (latest reline)	55s
rake test 3.0 (latest reline)	58s
vterm-yamatanooroti 3.0	1m 1s
rake test 3.0	55s
vterm-yamatanooroti 3.1 (latest reline)	1m 0s
rake test 3.1 (latest reline)	56s
vterm-yamatanooroti 3.1	59s
rake test 3.1	54s
vterm-yamatanooroti 3.2 (latest reline)	56s
rake test 3.2 (latest reline)	56s
vterm-yamatanooroti 3.2	59s
rake test 3.2	51s
vterm-yamatanooroti head (latest reline)	59s
rake test head (latest reline)	55s
vterm-yamatanooroti head	48s
rake test head	51s
rake test truffleruby-head (latest reline)	2m 50s
rake test truffleruby-head	2m 42s
	24m 59s

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