Update .gitlab-ci.yml file

  variables:

    PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"

    PAGES_BRANCH: gl-pages

    HTTPS_REMOTE: https://gitlab-ci-token:${CI_JOB_TOKEN}@${CI_SERVER_HOST}/rep/${CI_PROJECT_PATH}.git

    HTTPS_REMOTE: https://gitlab-ci-token:${CUSTOM_PROJECT_ACCESS_TOKEN}@${CI_SERVER_HOST}/rep/${CI_PROJECT_PATH}.git // CI_JOB_TOKEN is not allowed to push the code yet without feature flag enabled

  before_script:

    - pip install -q mkdocs-material mkdocs-glightbox mkdocs-markdownextradata-plugin mike 

    - apt-get update -qq && apt-get -qq install -y git > /dev/null