Add supported versions policy (#2742) #11

Job	Run time
build_node (ubuntu-latest)	1m 34s
Ruby 3.1 on ubuntu-latest	16m 27s
build_node (macos-latest)	1m 58s
Ruby 3.2 on ubuntu-latest	17m 45s
build_node (windows-latest)	7m 16s
Ruby 3.3 on ubuntu-latest	12m 20s
lint_node	41s
lint_ruby	22s
Ruby 3.1 on macos-latest	9m 40s
Ruby 3.2 on macos-latest	8m 2s
spelling	17s
Ruby 3.3 on macos-latest	6m 18s
Verify Jekyll website builds	11s
Ruby 3.1 on windows-latest	23m 57s
Ruby 3.2 on windows-latest	26m 9s
Ruby 3.3 on windows-latest	24m 58s
	2h 37m 55s

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