Merge pull request #29 from EnergySystemsModellingLab/add-code-cov #62

Job	Run time
test (macos-latest, 3.14, muse2_macos_arm.tar.gz, muse2)	49s
test (ubuntu-latest, 3.14, muse2_linux.tar.gz, muse2)	23s
test (windows-latest, 3.14, muse2_windows.zip, muse2.exe)	59s
	2m 11s

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