SAR-54 Include git installation for katversion

The docker image used doesn't contain git, so install it for katversion
to use.

.gitlab-ci.yml

@@ -29,7 +29,10 @@ build wheel:
   tags:
     - docker-executor
   script:
-    # note:  katversion will include the git hash in the version for non-tagged commits
+    # Note:  katversion will include the git hash in the version for non-tagged commits, but need git
+    # TODO:  consider moving git installation to ska-python-buildenv Dockerfile
+    - apt-get -y update
+    - apt-get install -y git --no-install-recommends
     - python setup.py sdist bdist_wheel
   artifacts:
     paths:
@@ -85,7 +88,7 @@ publish to nexus:
     TWINE_USERNAME: $TWINE_USERNAME
     TWINE_PASSWORD: $TWINE_PASSWORD
   script:
-    # check metadata requirements
+    # Check metadata requirements
     - scripts/validate-metadata.sh
     - pip install twine
     - twine upload --repository-url $PYPI_REPOSITORY_URL dist/*