FIX: Don't use tox for non-system Python

.gitlab-ci.yml

@@ -59,29 +59,23 @@ unittest_py3.8:
   stage: test
   needs: [ ]
   image: python:3.8
-  script:
-    # Python3.8 has problems with tox and pip so use plain pytest here
+  script: &python_test_script
+    # Python docker has problems with tox and pip so use plain pytest here
     - touch ~/.pycaosdb.ini
     - pip install nose pytest pytest-cov python-dateutil jsonschema==4.0.1
     - pip install .
     - python -m pytest unittests
 
+# This needs to be changed once Python 3.9 isn't the standard Python in Debian
+# anymore.
 unittest_py3.9:
   tags: [ docker ]
   stage: test
   needs: [ ]
-  image: python:3.9
-  script: &python_test_script
-    # Python3.8 has problems with tox and pip so use plain pytest here
+  script:
     - touch ~/.pycaosdb.ini
-    - cd unittests/docker
-    - cp sources.list.local /etc/apt/
-    - mv /etc/apt/sources.list /etc/apt/sources.list.orig
-    - cat /etc/apt/sources.list.local /etc/apt/sources.list.orig > /etc/apt/sources.list
-    - apt-get update && apt-get install -y tox
-    - cd ../..
     - make unittest
-    
+
 
 unittest_py3.10:
   tags: [ docker ]
@@ -116,12 +110,12 @@ build-testenv:
   stage: setup
   only:
       - schedules
-  script: 
+  script:
     - cd unittests/docker
     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
       # use here general latest or specific branch latest...
     - docker pull $CI_REGISTRY_IMAGE|| true
-    - docker build 
+    - docker build
       --pull
       --build-arg COMMIT=$CI_COMMIT_SHORT_SHA
       --cache-from $CI_REGISTRY_IMAGE