Beat [0/4]: improve itest miner #15008

Job	Run time
RPC and mobile compilation check	2m 44s
check commits	7m 44s
cross compilation	10m 4s
lint code	3m 48s
Sqlc check	5m 37s
sample configuration check	4m 28s
run unit tests (btcd unit-cover)	16m 39s
run unit tests (unit tags="kvdb_etcd")	18m 40s
check pinned dependencies (google.golang.org/grpc v1.59.0)	3s
run macOS itest	42m 7s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
run unit tests (unit tags="kvdb_postgres")	17m 35s
run unit tests (unit tags="kvdb_sqlite")	16m 43s
run windows itest	36m 31s
run unit tests (btcd unit-race)	35m 8s
run ubuntu itests (btcd, backend=btcd cover=1)	26m 47s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	33m 35s
run unit tests (unit-module)	59s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	33m 33s
check release notes updated	5s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	34m 28s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	43m 39s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	59m 12s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	35m 14s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	59m 42s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	35m 15s
run ubuntu itests (neutrino, backend=neutrino cover=1)	30m 43s
finish	3s
	10h 11m 12s

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