nix

Fix workflow #27

Job	Run time
build-test-install (ubuntu, gcc, 1)	1m 47s
build-test-install (ubuntu, gcc, 2)	1m 42s
build-test-install (ubuntu, gcc, 3)	1m 51s
build-test-install (ubuntu, gcc, 4)	1m 25s
build-test-install (ubuntu, gcc, 5)	1m 39s
build-test-install (ubuntu, gcc, 6)	1m 25s
build-test-install (ubuntu, clang, 1)	1m 54s
build-test-install (ubuntu, clang, 2)	1m 52s
build-test-install (ubuntu, clang, 3)	2m 1s
build-test-install (ubuntu, clang, 4)	1m 43s
build-test-install (ubuntu, clang, 5)	2m 0s
build-test-install (ubuntu, clang, 6)	1m 24s
build-test-install (macos, gcc, 1)	43s
build-test-install (macos, gcc, 2)	1m 3s
build-test-install (macos, gcc, 3)	49s
build-test-install (macos, gcc, 4)	42s
build-test-install (macos, gcc, 5)	50s
build-test-install (macos, gcc, 6)	49s
build-test-install (macos, clang, 1)	1m 13s
build-test-install (macos, clang, 2)	1m 33s
build-test-install (macos, clang, 3)	1m 19s
build-test-install (macos, clang, 4)	1m 13s
build-test-install (macos, clang, 5)	1m 13s
build-test-install (macos, clang, 6)	1m 16s
	33m 26s

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