pre-commit cached with terraform

.gitlab-ci.yml

pre-commit:
  image: python:3.8-buster
  variables:
    XDG_CACHE_HOME: ${CI_PROJECT_DIR}/.ci-cache
    PYTHONUSERBASE: ${CI_PROJECT_DIR}/.ci-cache
    TF_VERSION: 0.13.5
    PRE_COMMIT_VERSION: 2.9.0
  cache:
    # bust the cache if the python version changes
    key: ${CI_JOB_IMAGE}
    paths:
      - ${XDG_CACHE_HOME}
  before_script:
    - mkdir -p ${XDG_CACHE_HOME}/bin
    - export PATH=${XDG_CACHE_HOME}/bin:$PATH
    - pip install --user pre-commit==${PRE_COMMIT_VERSION}
    - |
      if ! ( terraform --version | grep v${TF_VERSION} ) 2>&1 > /dev/null; then
        temp=/tmp/terraform-${TF_VERSION}.zip
        curl -sSL -o $temp https://releases.hashicorp.com/terraform/${TF_VERSION}/terraform_${TF_VERSION}_linux_amd64.zip
        unzip $temp -d ${XDG_CACHE_HOME}/bin
      fi
  script:
    - pre-commit run --all-files