missing system libraries

.gitlab-ci.yml

@@ -9,6 +9,9 @@ cache:
     - venv/
 
 before_script:
+  - apt update
+  - apt upgrade
+  - apt install gcc python3-dev python3-pip libxml2-dev libxslt1-dev zlib1g-dev g++
   - python --version
   - pip install -r requirements.txt