added ccache to CI, removed slic3r step #364

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Run time

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Job	Run time
build (linux/arm64)	13m 32s
build (linux/arm64)	11m 28s
build (linux/amd64)	12m 31s
build (linux/amd64)	8m 15s
merge	1s
merge	1s
	45m 48s