Add workspace category #2285

Job	Run time
ruby-versions / Generate Ruby versions	2s
rake test 2.7 (latest reline)	55s
rake test 2.7	54s
rake test 3.0 (latest reline)	39s
rake test 3.0	42s
rake test 3.1 (latest reline)	30s
rake test 3.1	39s
rake test 3.2 (latest reline)	30s
rake test 3.2	31s
rake test head (latest reline)	28s
rake test head	34s
rake test truffleruby-head (latest reline)	6m 52s
rake test truffleruby-head	6m 26s
vterm-yamatanooroti 2.7 (latest reline)	1m 10s
vterm-yamatanooroti 2.7	1m 26s
vterm-yamatanooroti 3.0 (latest reline)	42s
vterm-yamatanooroti 3.0	1m 27s
vterm-yamatanooroti 3.1 (latest reline)	54s
vterm-yamatanooroti 3.1	51s
vterm-yamatanooroti 3.2 (latest reline)	51s
vterm-yamatanooroti 3.2	53s
vterm-yamatanooroti head (latest reline)	50s
vterm-yamatanooroti head	44s
	29m 30s

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