update drone.yml

drone.yml

@@ -56,7 +56,7 @@ steps:
     event: [ push, tag ]
   depends_on: [ prepare ]
   environment:
-    MAKEFLAGS: -j 4
+    MAKEFLAGS: -j 1
   commands:
     - export MAKEFLAGS && make
     - CONTENT=${DRONE_REPO_NAME}