buildextend-metal: fix --build to take an argument
It looks like the support for an argument passed to `--build` was
erroneously removed as part of
@@ -35,7 +35,7 @@ EOF
hostkey=src/config/secex-hostkey
rc=0
build=
-options=$(getopt --options h --longoptions help,build,hostkey: -- "$@") || rc=$?
+options=$(getopt --options h --longoptions help,build:,hostkey: -- "$@") || rc=$?
[ $rc -eq 0 ] || {
print_help
exit 1
