Exclude truffleruby-head from Actions #186

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-20.04 2.3	56s
ubuntu-20.04 2.4	1m 7s
ubuntu-20.04 2.5	57s
ubuntu-20.04 2.6	1m 4s
ubuntu-20.04 2.7	58s
ubuntu-20.04 3.0	20s
ubuntu-20.04 3.1	21s
ubuntu-20.04 3.2	18s
ubuntu-20.04 head	20s
ubuntu-20.04 jruby	1m 11s
ubuntu-20.04 jruby-head	1m 10s
ubuntu-22.04 2.3	1m 1s
ubuntu-22.04 2.4	49s
ubuntu-22.04 2.5	55s
ubuntu-22.04 2.6	57s
ubuntu-22.04 2.7	53s
ubuntu-22.04 3.0	18s
ubuntu-22.04 3.1	21s
ubuntu-22.04 3.2	20s
ubuntu-22.04 head	21s
ubuntu-22.04 jruby	1m 19s
ubuntu-22.04 jruby-head	1m 7s
macos-11 2.3	2m 6s
macos-11 2.4	2m 10s
macos-11 2.5	2m 0s
macos-11 2.6	2m 10s
macos-11 2.7	2m 5s
macos-11 3.0	34s
macos-11 3.1	1m 4s
macos-11 3.2	40s
macos-11 head	33s
macos-11 jruby	1m 13s
macos-11 jruby-head	1m 18s
macos-12 2.3	3m 22s
macos-12 2.4	2m 31s
macos-12 2.5	2m 42s
macos-12 2.6	2m 27s
macos-12 2.7	2m 17s
macos-12 3.0	26s
macos-12 3.1	26s
macos-12 3.2	26s
macos-12 head	27s
macos-12 jruby	1m 45s
macos-12 jruby-head	1m 39s
windows-latest 2.3	2m 42s
windows-latest 2.4	2m 46s
windows-latest 2.5	3m 32s
windows-latest 2.6	3m 58s
windows-latest 2.7	3m 2s
windows-latest 3.0	1m 53s
windows-latest 3.1	1m 23s
windows-latest 3.2	2m 28s
windows-latest head	1m 8s
windows-latest mswin	1m 53s
ubuntu-latest jruby-9.1	1m 21s
ubuntu-latest jruby-9.2	1m 25s
ubuntu-latest jruby-9.3	1m 6s
macos-latest truffleruby	1m 24s
ubuntu-latest truffleruby	1m 11s
	1h 22m 40s

Provide feedback