add the expanded feature list as annotation (can be found in the .release)

[mxmxchere]

Input:
push-mode: expand the cname to feature-set using the lib and the gardenlinux features folder
push-from-tarball: use the .release file

Output:

• Index-entries (referencing manifests)
• Manifest

Format:
I am 95% sure that the list in the os-release file is the output of ./parse_features features which in turn uses reverse_sort_nodes https://github.com/gardenlinux/builder/blob/e2dff5417ff2c6220c4226c585c006053957de5e/builder/parse_features#L211