Windows CI

`crystal tool format` #243

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Run time

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Job	Run time
x86_64-windows-libs	28s
x86_64-windows-llvm-libs	16s
x86_64-windows-dlls	21s
x86_64-windows-llvm-dlls	24s
x86_64-windows-release	0s
x86_64-windows / build	6m 40s
x86_64-windows-installer	0s
x86_64-windows-test	34m 42s
	42m 51s