add extend to python_install

.gitlab-ci.yml

@@ -11,10 +11,14 @@ include:
     - local: 'templates/python/code_quality/ruff/ruff.yml'
 
 python_install:
+    extends:
+        - .python_install
     stage: templates
     variables:
         PROJECT_PATH: "tests/python_install_project"
         PYTHON_SETUP: "pip install ${PROJECT_PATH}"
+    script:
+        - !reference [.python_install, script]
     only:
         changes:
             - .gitlab-ci.yml