Initialize nix setup for the repo #2295

Job	Run time
bazel_aspect	4m 54s
Maven tests (11)	4m 57s
Maven tests (17)	5m 43s
semanticdb-kotlinc	4m 15s
Maven tests (21)	4m 46s
bazel	2m 43s
Tests (ubuntu-latest, 11)	16m 43s
Docker CLI tests (ubuntu-latest)	7m 36s
check	7m 40s
Tests (ubuntu-latest, 17)	14m 8s
Tests (ubuntu-latest, 21)	9m 30s
	1h 22m 55s

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