Similar to the aleph file created for builds of FCOS based on ostree
commit inputs, this adds an aleph file that contains information about
the initial deployment of data when the disk image was built
A new stage is preferred here as both the org.osbuild.ostree.deploy
and org.osbuild.ostree.deploy.container stages need an aleph file and
use of the aleph file may depend on the project/product. For example,
right now CoreOS is the only project that uses an aleph file, but others
may want it in the future.
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