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Update go-containerregistry to pull in tarball foreign layer support #1131

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smukherj1
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Changed the name.Tag to name.Reference in maps from image names to images to conform to the new go-containerregistry API.

Added a test to ensure the manifest in the image tarball generated by the Go join_layers includes the foreign layer URL.

Changes:
1. --format arg dictates the format of the generated manifest to be
   pushed to the remote registry instead of the format of the incoming
   image.
2. Simply the image source argument from overloading the "--src" flag to
   having separate flags for config & tarball files.
Refactored the pusher, digester, flattener & join_layers binaries to use
all available layer parts to serve the layer digest & diffIDs. The
previous implementation would read the entire layer and actually compute
the digest instead of using the pre-computed digests.

Refactor the Starlark argument & input processing code for an image
stored in the intermediate format into a single function and reused this
function to provide the arguments to all the Go binaries.
Added a test for the base where the base image is derived from a
tarball.
Also updating storing references to images as name.Tag to name.Reference
because that's what the latest version of go-containerregistry requires.
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/gcbrun

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nlopezgi, smukherj1

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5 participants