added git; changed python image to 3.8

.gitlab-ci.yml

@@ -1,7 +1,7 @@
 # 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:3.9" 
+image: "python:3.8" 
 #commands to run in the Docker container before starting each job.
 before_script:
   - pip install -r ./requirements.txt
@@ -12,4 +12,5 @@ stages:
 pytest:
   stage: Test
   script:
+  - apk update; apk upgrade; apk add git
   - pytest -v ./tests