Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -1,14 +1,12 @@
-.only-pypi:
-  only:
-   - pypi
-
 stages:          # List of stages for jobs, and their order of execution
   - build
 
 build-job:       # This job runs in the build stage, which runs first.
-  extends: .only-pypi
   stage: build
 
+  rules:
+    - if: $CI_COMMIT_REF_NAME == "pypi" #when commit pushed in this branch it will trigger this job
+
   variables:
     TWINE_USERNAME: $USER_NAME
     TWINE_PASSWORD: $API_KEY