Python package

Added a build step, upgraded some action versions. #740

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Run time

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Job	Run time
build (3.10)	10m 32s
build (3.12)	11m 55s
build (3.11)	10m 35s
build (3.13)	10m 54s
build (3.9)	10m 57s
coveralls_finish	9s
	55m 2s