CI Checks - Rust Tests

Add `flake.nix` #3672

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Job	Run time
Linting	2m 25s
Documentation	1m 42s
build (macos-latest, 1.85.0)	13m 26s
build (self-hosted, 1.85.0)	11m 1s
build (self-hosted, stable)	10m 40s
build (macos-latest, stable)	13m 29s
build (windows-latest, beta)	7m 50s
build (windows-latest, 1.85.0)	7m 22s
build (macos-latest, beta)	13m 24s
build (self-hosted, beta)	5m 49s
build (windows-latest, stable)	7m 31s
	1h 34m 39s