Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -2,7 +2,7 @@ build-package:
   stage: deploy
   image: python:3.6
   script:
-    - pip install twine
+    - pip install twine build
     - cd run_af2
     - python3 -m build
     - TWINE_PASSWORD=${CI_JOB_TOKEN} TWINE_USERNAME=gitlab-ci-token python3 -m twine upload --repository-url https://git.scicore.unibas.ch/api/v4/projects/${CI_PROJECT_ID}/packages/pypi dist/*