nix

Fix workflow #28

Job	Run time
build-test-install (ubuntu, gcc, 1)	1m 37s
build-test-install (ubuntu, gcc, 2)	1m 47s
build-test-install (ubuntu, gcc, 3)	1m 49s
build-test-install (ubuntu, gcc, 4)	1m 35s
build-test-install (ubuntu, gcc, 5)	1m 37s
build-test-install (ubuntu, gcc, 6)	1m 26s
build-test-install (ubuntu, clang, 1)	1m 54s
build-test-install (ubuntu, clang, 2)	2m 14s
build-test-install (ubuntu, clang, 3)	1m 55s
build-test-install (ubuntu, clang, 4)	1m 42s
build-test-install (ubuntu, clang, 5)	1m 56s
build-test-install (ubuntu, clang, 6)	1m 20s
build-test-install (macos, gcc, 1)	1s
build-test-install (macos, gcc, 2)	1s
build-test-install (macos, gcc, 3)	1s
build-test-install (macos, gcc, 4)	1s
build-test-install (macos, gcc, 5)	1s
build-test-install (macos, gcc, 6)	1s
build-test-install (macos, clang, 1)	1m 48s
build-test-install (macos, clang, 2)	1m 35s
build-test-install (macos, clang, 3)	1m 16s
build-test-install (macos, clang, 4)	1m 18s
build-test-install (macos, clang, 5)	1m 10s
build-test-install (macos, clang, 6)	8s
	28m 13s

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