release: create branch for v0.18.4-beta.rc1 #16036

Job	Run time
RPC and mobile compilation check	5m 27s
Sqlc check	5m 1s
check commits	57m 21s
cross compilation	34m 35s
lint code	5m 9s
sample configuration check	3m 35s
run unit tests (btcd unit-cover)	2m 37s
run unit tests (unit tags="kvdb_etcd")	19m 15s
check pinned dependencies (google.golang.org/grpc v1.59.0)	6s
run unit tests (unit tags="kvdb_postgres")	18m 33s
run ubuntu itests (btcd, backend=btcd cover=1)	34m 27s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	3s
run unit tests (unit tags="kvdb_sqlite")	33s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	42m 4s
run unit tests (btcd unit-race)	37m 3s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	28s
run windows itest	36m 23s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	42m 40s
run unit tests (unit-module)	28s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	56m 15s
run macOS itest	54m 39s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	23s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	22s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1m 58s
check release notes updated	0s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	22s
run ubuntu itests (neutrino, backend=neutrino cover=1)	39m 48s
finish	4s
	8h 19m 39s

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