Delete .gitlab-ci.yml

.gitlab-ci.yml

-image: ubuntu
-
-build:
-  script:
-    - apt update
-    - apt install -y python3-pip
-    # install the python library
-    - apt install -y python3-venv
-
-    # within the root of the repository create the virtual environment
-    # This will use the default python 3 interpreter on your machine (3.6 on
-    # Ubuntu 18.04).
-    - python3 -m venv venv
-
-    # activate
-    - source venv/bin/activate
-
-    # test whether we can install that package into that virtual environment
-    - pip install -e ./