Use gcloud as a docker credential helper for all GCP registries. #428
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This will make the image a bit easier to use CI where docker auth is required.
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This will make the image a bit easier to use in CI where docker auth is required. However, there is a warning that having a long credential helper list (like would be added from this change) introduces slowness in
docker buildcommands. I believe this is because docker will fetch the credentials for each registry in the config file before the build itself. An alternative would be to use the standalone credential helper, but it's not available as a gcloud component.