Fix: Manpages Script breaks Dockerfiles #13442

Job	Run time
Sqlc check	24s
RPC and mobile compilation check	1m 32s
check commits	3m 1s
cross compilation	11m 13s
check pinned dependencies (google.golang.org/grpc v1.56.3)	4s
lint code	3m 4s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
sample configuration check	24s
run unit tests (btcd unit-cover)	16m 19s
run ubuntu itests	0s
run unit tests (unit tags="kvdb_etcd")	17m 55s
run windows itest	0s
run unit tests (unit tags="kvdb_postgres")	16m 43s
check release notes updated	0s
run unit tests (unit tags="kvdb_sqlite")	16m 5s
run unit tests (btcd unit-race)	33m 35s
run unit tests (unit-module)	44s
	2h 1m 7s

Provide feedback