build

Remove ruby-core workflow (#1075) #4336

Job	Run time
lint	12s
Debug compatibility test	5m 55s
ruby-versions / Generate Ruby versions	2s
rake test 2.7 (latest reline)	1m 43s
vterm-yamatanooroti 2.7 (latest reline)	54s
rake test 2.7	1m 44s
vterm-yamatanooroti 2.7	45s
rake test 3.0 (latest reline)	1m 33s
vterm-yamatanooroti 3.0 (latest reline)	2m 2s
rake test 3.0	1m 30s
vterm-yamatanooroti 3.0	31s
rake test 3.1 (latest reline)	1m 42s
vterm-yamatanooroti 3.1 (latest reline)	31s
rake test 3.1	1m 40s
vterm-yamatanooroti 3.1	30s
rake test 3.2 (latest reline)	1m 38s
vterm-yamatanooroti 3.2 (latest reline)	41s
rake test 3.2	1m 37s
rake test 3.3 (latest reline)	1m 45s
vterm-yamatanooroti 3.2	35s
vterm-yamatanooroti 3.3 (latest reline)	35s
rake test 3.3	1m 45s
vterm-yamatanooroti 3.3	32s
rake test 3.4 (latest reline)	2m 16s
vterm-yamatanooroti 3.4 (latest reline)	32s
rake test 3.4	2m 11s
vterm-yamatanooroti 3.4	32s
rake test head (latest reline)	12s
vterm-yamatanooroti head (latest reline)	34s
rake test head	6s
vterm-yamatanooroti head	47s
	37m 32s

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