fix: codelab schema examples

Signed-off-by: peefy <[email protected]>

Author: Peefy

examples/codelab/schema/my_config.k

@@ -2,8 +2,6 @@ import regex
 
 schema Deployment[priority]:
     name: str
-    cpu: int = _cpu
-    memory: int = _cpu * 2
     volumes?: [Volume]
     image: str
     service?: Service
@@ -20,6 +18,9 @@ schema Deployment[priority]:
     else:
         _cpu = 2048
 
+    cpu: int = _cpu
+    memory: int = _cpu * 2
+
     check:
         multiplyof(cpu, 256), "cpu must be a multiplier of 256"
         regex.match(image, "^[a-zA-Z]+:\d+\.\d+\.\d+$"), "image name should be like 'nginx:1.14.2'"