File _service of Package elemental-unstable-channel-image

<services>
  <service name="kiwi_metainfo_helper" mode="buildtime"/>
  <service name="docker_label_helper" mode="buildtime"/>
  <service name="replace_using_env" mode="buildtime">
    <param name="file">Dockerfile.unstable</param>
    <param name="eval">IMG_REPO=$(rpm --macros=/root/.rpmmacros -E %img_repo)</param>
    <param name="var">IMG_REPO</param>
  </service>
</services>