Liniakea integration / Making official devkit images

Tracking bug for integration into PureOS builds:

switch to PureOS (!26 (merged))
allow to disable inclusion of CI packages
sort out how to communicate with Laniakea which artifacts to build
What about external dependencies (e.g. our imx6/imx8 kernels and u-boot are not in PureOS proper atm (#4, #3 (closed))
depend on pureos-minimal

Edited Dec 08, 2018 by Guido Gunther

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