Update .gitlab-ci.yml

.gitlab-ci.yml

+# This file is a template, and might need editing before it works on your project.
+# Official language image. Look for the different tagged releases at:
+# https://hub.docker.com/r/library/python/tags/
+image: python:latest
+
+# Change pip's cache directory to be inside the project directory since we can
+# only cache local items.
+variables:
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+
+# Pip's cache doesn't store the python packages
+# https://pip.pypa.io/en/stable/reference/pip_install/#caching
+#
+# If you want to also cache the installed packages, you have to install
+# them in a virtualenv and cache it as well.
+cache:
+  paths:
+    - .cache/pip
+    - venv/
+
 before_script:
-  - apt-get update -y
-  - apt-get install python3 -y
-  - python --version ; pip --version
+  - python -V
   - pip install virtualenv
   - virtualenv venv
   - source venv/bin/activate
 
 run:
   script:
-    - pip install -r requirements.txt
+  - pip install -r requirements.txt
 
-start:
-  script:
-  - python3 main.py
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