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When building, if images are being pushed, ensure that only named images (i.e. services with a populated `image` field) are attempted to be pushed. Services without `image` get an auto-generated name, which will be a "Docker library" reference since they're in the format `$project-$service`, which is implicitly the same as `docker.io/library/$project-$service`. A push for that is never desirable / will always fail. The key here is that we cannot overwrite the `<svc>.image` field when doing builds, as we need to be able to check for its presence to determine whether a push makes sense. Fixes #10813. Signed-off-by: Milas Bowman <milas.bowman@docker.com>