Split CI from build actions, since they're for pretty different use-cases #7

Job	Run time
build (android, arm64, ubuntu-22.04, template_debug, single)	55s
build (linux, x86_64, ubuntu-22.04, template_debug, double)	36s
build (windows, x86_64, windows-latest, template_release, single)	3m 24s
build (macos, universal, macos-latest, template_debug, single)	34s
build (web, wasm32, ubuntu-22.04, template_release, double)	51s
	6m 20s

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