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To create an auditable log of packages installed in an image use dpkg-query to create a json data file with the package names, version and install status. Change-Id: I59018221edcb944a876ad47b402538c63c426bc7
Provide dpkg specific image building glue.
The ubuntu element needs customisations at the start and end of the image build process that do not apply to RPM distributions, such as using the host machine HTTP proxy when installing packages. These customisations live here, where they can be used by any dpkg based element.
The dpkg specific version of install-packages is also kept here.