trying to improve online docs rendering

.gitlab-ci.yml

@@ -3,6 +3,7 @@ image: ubuntu:21.04
 test:
   stage: test
   script:
+  - apt-get update
   - apt-get install build_essential gcc cmake python3-pip python3 python3-dev
   - pip install -U -r requirements.txt
   - python setup.py install
@@ -15,6 +16,7 @@ test:
 pages:
   stage: deploy
   script:
+  - apt-get update
   - apt-get install build_essential gcc cmake python3-pip python3 python3-dev
   - pip install -U -r requirements.txt
   - python setup.py install