Prepare for custom channels (lnd v0.18.4-beta) #1934

Job	Run time
check commits	3m 50s
frontend tests on ubuntu-latest	2m 24s
backend build on ubuntu-latest	4m 28s
frontend tests on windows-latest	8m 16s
integration test	20m 29s
backend build on windows-latest	16m 0s
frontend tests on macOS-latest	3m 5s
lint	5m 37s
backend build on macOS-latest	7m 24s
RPC proto compilation check	4m 26s
check release notes updated	4s
unit-race	1m 58s
unit tests	2m 44s
	1h 20m 45s

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