L2SS-259: Ensure git is installed for CI docker image

.gitlab-ci.yml

@@ -6,8 +6,9 @@ cache:
   paths:
     - .cache/pip
     - .tox
-#before_script:
-#  - pip install tox
+before_script:
+  - sudo apt-get update
+  - sudo apt-get install -y git
 stages:
   - linting
   - unit-tests