[release/1.7] push: inherit distribution sources from parent #9084
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Backport #9029
When a blob does not exist locally, rather than erroring on info
lookup, inherit the parent distribution sources. Push is able
to succeed even if the blob does not exist locally when a cross
repository mount is done. This is a common operation pushing a
multi-platform image to the same registry but different namespace.
ctr
change not included because it is a behavior change