Hints for kdocker in main

Warnings

• asv-metainfo-invalid-icon-type
  kdocker.appdata.xml:17 - local
  Metainfo files may only contain icons of type `stock` or `remote`, the set type is not allowed.
• asv-screenshot-no-media
  kdocker.appdata.xml:23 -
  A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.
• asv-metainfo-invalid-icon-type
  kdocker.appdata.xml:15 - cached
  Metainfo files may only contain icons of type `stock` or `remote`, the set type is not allowed.
• asv-cid-desktopapp-is-not-rdns
  kdocker.appdata.xml:3 - kdocker.desktop
  The component ID is not a reverse domain-name. Please update the ID to avoid future issues and be compatible with all AppStream implementations. You may also consider to update the name of the accompanying .desktop file to follow the latest version of the Desktop-Entry specification and use a rDNS name for it as well. In any case, do not forget to mention the new desktop-entry in a <launchable/> tag for this component to keep the application launchable from software centers and the .desktop file data associated with the metainfo data.
• screenshot-download-error
  Error while downloading screenshot from '': Failed to download file: URL using bad/illegal format or missing URL
  This might be a temporary server issue, or the screenshot is no longer available.