[custom channels 4/5]: Extract PART4 from mega staging branch #15816

Job	Run time
Sqlc check	4m 26s
cross compilation	14m 20s
check commits	20m 52s
lint code	8m 36s
check pinned dependencies (google.golang.org/grpc v1.59.0)	6s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
RPC and mobile compilation check	7m 59s
sample configuration check	6m 15s
run unit tests (btcd unit-cover)	2m 16s
run unit tests (unit tags="kvdb_etcd")	19m 20s
run macOS itest	51m 14s
run unit tests (unit tags="kvdb_postgres")	18m 35s
run ubuntu itests (btcd, backend=btcd cover=1)	29m 32s
run unit tests (unit tags="kvdb_sqlite")	17m 26s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	38m 14s
run unit tests (btcd unit-race)	36m 11s
run unit tests (unit-module)	1m 11s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	38m 12s
run windows itest	31m 28s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	39m 49s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	53m 5s
check release notes updated	0s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 10m 50s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	40m 29s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 10m 41s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	41m 14s
run ubuntu itests (neutrino, backend=neutrino cover=1)	36m 23s
finish	4s
	11h 38m 52s

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