Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -77,7 +77,7 @@ hello_python:
   variables: 
     MESSAGE: "Hello from Python"
   script: |
-    MESSAGE=$MESSAGE python -c '
+    export MESSAGE=$MESSAGE; python -c '
     import os
     print(os.environ.get('MESSAGE'))
     print("Hello, World! with Python")