release: create branch for v0.18.4-beta.rc1 #16156

Job	Run time
Sqlc check	5m 24s
lint code	4m 7s
cross compilation	31m 21s
check commits	40m 2s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
RPC and mobile compilation check	5m 30s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
sample configuration check	3m 46s
run unit tests (btcd unit-cover)	2m 8s
run unit tests (unit tags="kvdb_etcd")	19m 20s
run macOS itest	52m 5s
run unit tests (unit tags="kvdb_postgres")	18m 28s
run ubuntu itests (btcd, backend=btcd cover=1)	33m 22s
run unit tests (unit tags="kvdb_sqlite")	17m 5s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	40m 36s
run unit tests (btcd unit-race)	36m 39s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	39m 58s
run unit tests (unit-module)	3m 43s
run windows itest	5m 18s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	41m 4s
check release notes updated	0s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	54m 42s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 12m 58s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	43m 20s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 12m 44s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	43m 6s
run ubuntu itests (neutrino, backend=neutrino cover=1)	38m 10s
finish	4s
	12h 5m 9s

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