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fix: Use canary/nightly based on current triple target. #26

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Job	Run time
Format (ubuntu-latest)	12s
Lint (ubuntu-latest)	1m 28s
Test (ubuntu-latest)	17m 14s
Format (windows-latest)	38s
Lint (windows-latest)	4m 19s
Test (macos-latest)	9m 31s
Test (windows-latest)	17m 9s
	50m 31s