Start work on python script

.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: busybox
+image: "python:3"
 
 pages:
   stage: deploy
   script:
-    - echo "The site will be deployed to $CI_PAGES_URL"
+    - python3 -m pip install -r requirements.txt
+    - python3 build_site.py
   artifacts:
     paths:
       - public

build_site.py

+import shutil
+shutil.copyfile("templates/index.html", "public/index.html")
\ No newline at end of file

requirements.txt

+Jinja2~=3.1.4
\ No newline at end of file