Average grades in export #3929

Job	Run time
Backup process	2m 58s
Build wheel	1m 49s
Linter	2m 8s
Formatting	1m 31s
Build nix environment on MacOS	3m 3s
MyPy	1m 32s
Test Frontend	3m 22s
Test + Coverage	2m 51s
Test (shuffled order)	2m 20s
Test if testdata is up to date	2m 9s
Test Typescript	1m 39s
Install wheel with system Python	15s
	25m 37s

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