Add `crystal spec --list-tags` #9379

Job	Run time
check_format	2m 25s
x86_64-gnu-test-preview_mt	6m 40s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	16m 22s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	16m 20s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	16m 21s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	16m 22s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	16m 21s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	16m 22s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	16m 22s
x86_64-gnu-test (1.7.3)	16m 22s
x86_64-gnu-test (1.8.2)	16m 22s
x86_64-gnu-test (1.9.2)	16m 22s
x86_64-musl-test	16m 20s
deploy_api_docs	0s
	3h 9m 1s

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