Optimize CI workflow. #929

Job	Run time
init	1s
macos	12m 6s
android	19m 48s
linux	11m 36s
windows	11m 3s
docs	38s
air-samples (4.0.5)	2m 38s
flash-samples	41s
air-samples (4.1.5)	2m 44s
html5-samples	1m 21s
air-samples (4.2.5)	3m 15s
ios	30m 28s
air-samples (4.3.1)	2m 41s
package-haxelib	5m 35s
neko-samples (3.4.7, windows-latest)	5m 42s
neko-samples (3.4.7, ubuntu-20.04)	5m 22s
hashlink-samples (windows-latest)	1m 48s
neko-samples (3.4.7, macos-12)	4m 11s
hashlink-samples (ubuntu-20.04)	1m 0s
neko-samples (4.2.5, windows-latest)	1m 49s
hashlink-samples (macos-12)	1m 54s
neko-samples (4.2.5, ubuntu-20.04)	2m 58s
neko-samples (4.2.5, macos-12)	2m 38s
notify	0s
	2h 11m 57s

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