Tests

nix: add flake and derivation #926

Job	Run time
benchmark - ubuntu-latest - utils	6m 28s
lint - rln - ubuntu-latest	6m 24s
test - rln - ubuntu-latest - default	8m 25s
benchmark - ubuntu-latest - rln - default	23m 5s
lint - utils - ubuntu-latest	6m 28s
test - rln - ubuntu-latest - arkzkey	8m 51s
benchmark - ubuntu-latest - rln - arkzkey	41m 58s
test - rln - ubuntu-latest - stateless	8m 23s
test - rln-wasm - ubuntu-latest	7m 55s
test - utils - ubuntu-latest	7m 24s
test - rln - macos-latest - default	9m 50s
test - rln-wasm - macos-latest	8m 48s
test - utils - macos-latest	6m 26s
test - rln - macos-latest - arkzkey	11m 28s
test - rln - macos-latest - stateless	9m 55s
	2h 51m 48s

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