Add official python image and creation of the virtual environment with pip.

.gitlab-ci.yml

@@ -15,12 +15,35 @@
 # https://docs.gitlab.com/ee/development/cicd/templates.html
 # This specific template is located at:
 # https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Getting-Started.gitlab-ci.yml
+# Python-specific template is located at
+# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Python.gitlab-ci.yml
+
+# 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"
+
+# https://pip.pypa.io/en/stable/topics/caching/
+cache:
+  paths:
+    - .cache/pip
+
+before_script:
+  - python --version ; pip --version  # For debugging
+  - pip install virtualenv
+  - virtualenv venv
+  - source venv/bin/activate
 
 stages:          # List of stages for jobs, and their order of execution
   - build
   - test
   - deploy
 
+
 build-job:       # This job runs in the build stage, which runs first.
   stage: build
   script: