[custom channels 4/5]: Extract PART4 from mega staging branch #15828

Job	Run time
RPC and mobile compilation check	2m 13s
lint code	4m 5s
cross compilation	11m 37s
sample configuration check	1m 2s
Sqlc check	2m 45s
check commits	25m 52s
run unit tests (btcd unit-cover)	17m 27s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
run unit tests (unit tags="kvdb_etcd")	19m 35s
run macOS itest	51m 55s
run unit tests (unit tags="kvdb_postgres")	18m 19s
run unit tests (unit tags="kvdb_sqlite")	17m 6s
run unit tests (btcd unit-race)	36m 49s
run ubuntu itests (btcd, backend=btcd cover=1)	14m 24s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	3s
run unit tests (unit-module)	1m 10s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	20m 20s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	19m 1s
check release notes updated	0s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	15m 46s
run windows itest	33m 6s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	20m 17s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	18m 57s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	16m 51s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	16m 57s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	15m 42s
run ubuntu itests (neutrino, backend=neutrino cover=1)	14m 18s
finish	4s
	6h 55m 45s

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