CI: Cache conda packages #163

Job	Run time
devcheck (3.8, pydra)	27s
build	24s
devcheck (3.8, --editable git+https://github.com/nipype/pydra.git#egg=pydra)	30s
test (3.8)	1m 35s
devcheck (3.8, --editable, pydra)	27s
test (3.9)	1m 24s
devcheck (3.8, --editable, --editable git+https://github.com/nipype/pydra.git#egg=pydra)	29s
test (3.10)	1m 38s
devcheck (3.12, pydra)	34s
test (3.11)	1m 30s
devcheck (3.12, --editable git+https://github.com/nipype/pydra.git#egg=pydra)	36s
test (3.12)	1m 32s
devcheck (3.12, --editable, pydra)	35s
devcheck (3.12, --editable, --editable git+https://github.com/nipype/pydra.git#egg=pydra)	36s
deploy	0s
	12m 17s

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