gitlab-ci fix

.gitlab-ci.yml

-image: python:3.9-buster
+image: python:3.10-buster
 
 variables:
   PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
@@ -18,6 +18,7 @@ build:
   when: manual
   before_script:
     # Install all required packages
+    - apt-get update -y
     - apt-get install -y -qq graphviz
     - pip install -r requirements.txt
   script: