fix(publish): remove variable from rules:exists expression (unsupported)

  stage: publish

  script:

    - helm ${TRACE+--debug} $(get_helm_config_opt) repo index $HELM_PUBLISH_DIR --url $HELM_PUBLISH_URL $HELM_PUBLISH_ARGS

  rules:

    - if: $CI_MERGE_REQUEST_ID || $HELM_PUBLISH_URL == null || $CI_COMMIT_REF_NAME !~ $PROD_REF

      when: never

    - exists:

        - $HELM_CHART_DIR/Chart.yaml

  artifacts:

    expire_in: 1 week

    paths:

      - $HELM_PUBLISH_DIR

  rules:

    - if: $CI_MERGE_REQUEST_ID || $HELM_PUBLISH_URL == null || $CI_COMMIT_REF_NAME !~ $PROD_REF

      when: never

    # /!\ variables can't be used in rules:exists

    - exists:

        - "**/Chart.yaml"

# Deploy job prototype

# Can be extended to define a concrete environment