Clean up ciwb before steps #88

Job	Run time
build (python, ubuntu-latest)	34s
build (python, macos-latest)	53s
build (js, macos-latest)	1m 6s
build (jupyter, ubuntu-latest)	1m 50s
build (rust, macos-latest)	4m 56s
build (js, ubuntu-latest)	1m 10s
build (jupyter, macos-latest)	1m 48s
build (rustjswasm, ubuntu-latest)	6m 47s
build (rustjswasm, macos-latest)	8m 21s
build (rust, ubuntu-latest)	4m 39s
	32m 4s

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