Fix ci

.gitlab-ci.yml

 stages:
-  - build
+  - core
+  - extras
 
 core_linux_27:
-  stage: build
+  stage: core
   before_script:
     - git clean -ffdx
   script:
     - ./build.sh core.txt 2.7
-    - ./_ci/wheels.sh
   after_script:
     - git clean -ffdx src
   tags:
     - conda-linux
 
 extras_linux_27:
-  stage: build
+  stage: extras
   dependencies:
     - core_linux_27
   before_script:
     - git clean -ffdx
   script:
     - ./build.sh extras.txt 2.7
-    - ./_ci/wheels.sh
   after_script:
     - git clean -ffdx
   tags: