Optimize CI workflow. #924

Job	Run time
init	1s
android	19m 33s
macos	23m 6s
windows	10m 46s
linux	11m 27s
air-samples (4.0.5)	2m 46s
flash-samples	40s
html5-samples	1m 24s
air-samples (4.1.5)	2m 39s
docs	49s
air-samples (4.2.5)	2m 40s
air-samples (4.3.1)	2m 50s
ios	30m 12s
package-haxelib	5m 37s
hashlink-samples (windows-latest)	1m 55s
neko-samples (3.4.7, windows-latest)	5m 38s
hashlink-samples (ubuntu-20.04)	3m 6s
hashlink-samples (macos-12)	4m 8s
neko-samples (3.4.7, ubuntu-20.04)	3m 6s
neko-samples (3.4.7, macos-12)	8m 31s
neko-samples (4.2.5, windows-latest)	6m 46s
neko-samples (4.2.5, ubuntu-20.04)	3m 7s
neko-samples (4.2.5, macos-12)	2m 18s
notify	0s
	2h 33m 5s

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