nix

Codecov coverage reporting fixes #2925

Job	Run time
dependencies (linux, gcc, Debug)	2m 11s
dependencies (linux, gcc, Release)	1m 30s
dependencies (linux, clang, Debug)	1m 49s
dependencies (linux, clang, Release)	1m 29s
coverage (linux, gcc, Debug)	29m 2s
test (linux, gcc, Debug)	11m 52s
test (linux, gcc, Debug, -Dunity=ON)	7m 8s
test (linux, gcc, Release)	14m 31s
test (linux, gcc, Release, -Dunity=ON)	8m 46s
test (linux, clang, Debug)	9m 37s
test (linux, clang, Debug, -Dunity=ON)	5m 43s
test (linux, clang, Release)	12m 38s
test (linux, clang, Release, -Dunity=ON)	8m 28s
	1h 54m 44s

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