Merge pull request #12582 from roberth/nix-everything-symlink-megafarm #15225

Job	Run time
eval	50s
Check Docker secrets present for installer tests	1s
vm_tests	13m 34s
tests on ubuntu	8m 33s
tests on macos	8m 33s
installer test on ubuntu	31s
installer test on macos	1m 11s
flake_regressions	11m 39s
docker_push_image	3m 30s
	48m 22s

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