[custom channels]: enforce minimum amounts #3593

Job	Run time
cross compilation	5m 10s
Format check	22s
Docker build check	3m 36s
Compilation check	52s
run itests	9m 42s
run itests postgres	17m 31s
Lint check	2m 50s
migration version check	10s
go mod check	20s
RPC check	1m 13s
run LiT tests	3m 2s
sample configuration check	47s
Sqlc check	28s
test vector check	53s
run unit tests (unit-race)	11m 17s
run unit tests (unit-cover)	3m 8s
run unit tests (unit dbbackend=postgres)	6m 3s
finish	7s
	1h 7m 31s

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