Optimize CI workflow. #934

Job	Run time
docs	40s
android	20m 0s
air-samples (4.0.5)	2m 42s
flash-samples	38s
air-samples (4.1.5)	2m 55s
html5-samples	1m 29s
ios	19m 53s
air-samples (4.2.5)	2m 23s
air-samples (4.3.1)	2m 49s
linux	11m 21s
macos	14m 31s
windows	12m 11s
package-haxelib	5m 47s
neko-samples (3.4.7, windows-latest)	1m 58s
hashlink-samples (windows-latest)	1m 58s
hashlink-samples (ubuntu-20.04)	6m 31s
neko-samples (3.4.7, ubuntu-20.04)	1m 2s
hashlink-samples (macos-12)	5m 1s
neko-samples (3.4.7, macos-12)	4m 45s
neko-samples (4.2.5, windows-latest)	5m 55s
neko-samples (4.2.5, ubuntu-20.04)	3m 9s
neko-samples (4.2.5, macos-12)	7m 38s
notify	0s
	2h 15m 16s

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