build__common: bugfix wrong substitution

build__common.sh

@@ -72,7 +72,7 @@ common_end() {
 
         if [ "${action:-}" = "deploy" ]; then
                 docker compose -p ${target} -f ${dc_file} up ${detach:-}
-                wait_seconds="${wait_seconds:0}"
+                wait_seconds="${wait_seconds:-0}"
                 echo "Give ${wait_seconds} seconds to this new deployment to be setted up"
                 sleep "${wait_seconds}"
         fi