Because we often rely on branch names, upstream sources can change when build images later. Solve for this issue and simplify process for duplicating the build of a released image.
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the images which are finally released should be somehow reproducible.. something like ./compile.sh $RANDOM_FANCY_VARIABLE=release_2002 and it fetches exactly the sources which were used to produce the release (either over the armbian repo/sources) or by commit hash (which can be problematic from time to time, ask @TonyMac32 and the story of rockchip). So that someone who wants to build a 'know working' (in case it was tested for the board in question) image can build and patch on top of the release..