main: make error messages more accurate #1330

Job	Run time
backend build on ubuntu-latest	2m 28s
frontend tests on ubuntu-latest	1m 40s
integration test	6m 58s
check commits	32s
backend build on windows-latest	12m 49s
frontend tests on windows-latest	1m 44s
backend build on macOS-latest	7m 1s
frontend tests on macOS-latest	1m 50s
lint	0s
unit tests	26s
unit-race	24s
RPC proto compilation check	3m 36s
	39m 28s

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