PR1: Slightly optimizing and fixing initial distrubutions handling (#… #757

Job	Run time
Cache minimal Nix dependencies	1m 8s
Run and cache flake checks	47s
Build and run tests	36m 33s
Cache all Nix dependencies	1m 36s
Build and deploy documentation	53m 13s
Check tests output	3s
	1h 33m 20s

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