fix: gitlabci file

.gitlab-ci.yml

 image: python:3.6
 
 publish:
-    script:
+  script:
     - pip install sphinx
     - pip install sphinxcontrib-httpdomain
     - pip install sphinx_rtd_theme
@@ -9,5 +9,7 @@ publish:
     - sphinx-build -d html "source" "build"
     - echo "$SSH_DEPLOY_KEY" | tr -d '\r' > gitlab.key && chmod 600 gitlab.key
     - scp -i gitlab.key -o StrictHostKeyChecking=no -r build/* documentation@astral.startinblox.com:~/doc/
-    only:
+  only:
     - master
+  tags:
+    - deploy