Use python:3.9-alpine

.gitlab-ci.yml

@@ -1,9 +1,9 @@
-image: ubuntu:20.04
+image: python:3.9-alpine
 
 pages:
     stage: deploy
     script:
-        - sudo apt-get update && DEBIAN_FRONTEND=noninteractive sudo apt-get install -y --no-install-recommendspython3 python3-pip && python3 -m pip install -r requirements.txt && cd public/sbbs && python3 ../../gensbbsrss.py
+        - pip install -r requirements.txt && cd public/sbbs && python3 ../../gensbbsrss.py
     artifacts:
         paths:
             - public