CI

feat: add config "flat/all" #1016

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Run time

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Job	Run time
Lint	30s
Test (ubuntu-latest, 8.x, 18.x)	45s
Test (ubuntu-latest, 8.x, 20.x)	39s
Test (ubuntu-latest, 8.x, 22.x)	40s
Test (ubuntu-latest, 8.x, 23.x)	37s
Test (ubuntu-latest, 9.x, 18.x)	39s
Test (ubuntu-latest, 9.x, 20.x)	37s
Test (ubuntu-latest, 9.x, 22.x)	33s
Test (ubuntu-latest, 9.x, 23.x)	36s
Test (windows-latest, 8.x, 18.x)	1m 20s
Test (windows-latest, 8.x, 20.x)	1m 17s
Test (windows-latest, 8.x, 22.x)	1m 36s
Test (windows-latest, 8.x, 23.x)	1m 25s
Test (windows-latest, 9.x, 18.x)	1m 26s
Test (windows-latest, 9.x, 20.x)	1m 30s
Test (windows-latest, 9.x, 22.x)	1m 5s
Test (windows-latest, 9.x, 23.x)	58s
Test (macOS-latest, 8.x, 18.x)	1m 5s
Test (macOS-latest, 8.x, 20.x)	59s
Test (macOS-latest, 8.x, 22.x)	59s
Test (macOS-latest, 8.x, 23.x)	50s
Test (macOS-latest, 9.x, 18.x)	58s
Test (macOS-latest, 9.x, 20.x)	45s
Test (macOS-latest, 9.x, 22.x)	46s
Test (macOS-latest, 9.x, 23.x)	54s
Test (ubuntu-latest, 18.18.0, 8.x)	37s
Test (ubuntu-latest, 20.9.0, 8.x)	34s
Test (ubuntu-latest, 21.1.0, 8.x)	38s
Test (ubuntu-latest, 21.x, 8.x)	41s
	25m 59s