[custom channels]: enforce minimum amounts #1922

Job	Run time
check commits	2m 37s
integration test	4m 14s
backend build on ubuntu-latest	11m 31s
frontend tests on ubuntu-latest	5m 3s
backend build on windows-latest	16m 7s
lint	3m 36s
frontend tests on windows-latest	9m 24s
backend build on macOS-latest	9m 19s
frontend tests on macOS-latest	5m 34s
RPC proto compilation check	49s
check release notes updated	3s
unit tests	2m 41s
unit-race	3m 44s
	1h 14m 42s

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