Nix: initial packaging & flake (#465) #1791

Job	Run time
Run on macos-14 with SOFA master and python 3.10	3m 45s
Run on ubuntu-22.04 with SOFA master and python 3.10	4m 54s
Run on windows-2022 with SOFA master and python 3.10	14m 36s
Deploy artifacts	7s
	23m 22s

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