[custom channels]: enforce minimum amounts #3609

Job	Run time
Compilation check	5m 5s
Docker build check	3m 39s
Format check	2m 37s
cross compilation	15m 10s
run itests postgres	22m 52s
run itests	14m 0s
Lint check	6m 6s
migration version check	10s
go mod check	2m 43s
RPC check	3m 24s
sample configuration check	4m 0s
run LiT tests	4m 26s
Sqlc check	5m 1s
test vector check	4m 17s
run unit tests (unit-race)	11m 37s
run unit tests (unit-cover)	7m 6s
run unit tests (unit dbbackend=postgres)	5m 49s
finish	4s
	1h 58m 6s

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