Merge pull request #11657 from DeterminateSystems/nix-copy-gc #13300

Job	Run time
Check Cachix and Docker secrets present for installer tests	1s
vm_tests	13m 13s
tests (ubuntu-latest)	19m 21s
tests (macos-latest)	33m 34s
flake_regressions	15m 47s
installer	15m 7s
docker_push_image	2m 8s
installer_test (ubuntu-latest)	43s
installer_test (macos-latest)	43s
	1h 40m 37s

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