Update file .gitlab-ci.yml

.gitlab-ci.yml

 # This file is a template, and might need editing before it works on your project.
 # Full project: https://gitlab.com/pages/plain-html
 
-image: python:3.8-slim
+#image: python:3.8-slim
+#
+#stages:
+#  - build
 
-stages:
-  - build
+#pages:
+#  script:
+#    - pip3 install -r requirements.txt
+#    - sphinx-build -b html docs/source/ public/
+#  artifacts:
+#    paths:
+#      - public
+#  only:
+#    - master 
+
+image: python:3.8-alpine
+
+test:
+  stage: test
+  script:
+  - pip install -U sphinx
+  - sphinx-build -b html . public
+  only:
+  - branches
+  except:
+  - master
 
 pages:
+  stage: deploy
   script:
-    - pip3 install -r requirements.txt
-    - sphinx-build -b html docs/source/ public/
+  - pip install -U sphinx
+  - sphinx-build -b html . public
   artifacts:
     paths:
-      - public
+    - public
   only:
-    - master 
+  - master