Try with a different baseimage

.gitlab-ci.yml

-image: python:3.6
+image: themattrix/tox
 
 cache:
     paths:
         - .tox
 
 before_script:
-    # Install pyenv
-    - apt-get update
-    - apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev
-    - git clone https://github.com/pyenv/pyenv.git ~/.pyenv
-    - export PYENV_ROOT="$HOME/.pyenv"
-    - export PATH="$PYENV_ROOT/bin:$PATH"
-    - eval "$(pyenv init -)"
-    # Install tox
-    - pyenv install 3.6.8
-    - pyenv install 3.7.2
+    # Any pre-test setup
+    echo "Setting Up...."
 
 tests:
     script: