It was possible to still export the docker-compatible manifest.json
file, if a single platform image (as a standalone manifest) was
exported, even if the WithSkipDockerManifest option was explicitly set.
To resolve this, we remove all references to skipDockerManifest to,
adding it instead to the point-of-writing, simplifying the earlier logic
and making it clear exactly when this manifest file should be written.
Signed-off-by: Justin Chadwell <me@jedevc.com>
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