fix(discord_notifier): httpie image, install pipenv

   - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH && $CI_PROJECT_PATH_SLUG == "r2devops-hub"'

discord_notifier:

  image: python:${IMAGE_TAG_PYTHON_ALPINE}

  image:

    name: alpine/httpie:${IMAGE_TAG_HTTPIE_ALPINE}

    entrypoint: [""]

  stage: .after-deploy

  variables:

    RELEASE_PATH: "${CI_PROJECT_DIR}/releases" 

  dependencies:

    - template_release

  variables:

    RELEASE_PATH: "${CI_PROJECT_DIR}/releases" 

    PIPENV_PIPFILE: tools/notify/Pipfile

  before_script:

    - apk update && apk add --no-cache bash

    - pip install --ignore-installed distlib pipenv

    - pipenv install

  script:

    - RELEASES=$(ls "$RELEASE_PATH")

    - |