[various] use GitHub workflows for validation instead of Cirrus (#2155) #21

Job	Run time
Run Dart Analyzer	1m 38s
Run Dart Analyzer	1m 38s
Build Android example app (3.0.0)	3m 34s
Build Android example app (3.0.0)	3m 34s
Build Android example app (stable channel)	3m 48s
Build Android example app (stable channel)	3m 48s
Build iOS example app (stable channel)	4m 44s
Build iOS example app (stable channel)	4m 44s
Build macOS example app (stable channel)	5m 9s
Build macOS example app (stable channel)	5m 9s
Build Linux example app (3.0.0)	2m 11s
Build Linux example app (3.0.0)	2m 11s
Build Linux example app (stable channel)	1m 42s
Build Linux example app (stable channel)	1m 42s
Run integration tests (Android)	16m 32s
Run integration tests (Android)	2m 47s
Run integration tests (iOS)	7m 23s
Run integration tests (iOS)	7m 23s
Run all unit tests (Android)	4m 10s
Run all unit tests (Android)	4m 10s
Run all unit tests (Dart)	1m 34s
Run all unit tests (Dart)	1m 34s
	1h 31m 5s

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