Preserve runner Docker settings in isolated CI configuration

[peterd-NV]

Summary

Update the pre-merge and nightly to preserve the runner’s docker client
configuration while still to isolating jobs from stale Docker credentials.

CI previously used an empty temporary docker config to prevent stale NVCR credentials from
affecting image pulls. However, this also discarded non-authentication settings from the
runner, including proxy and buildx configuration needed for reliable package downloads during
Docker builds.

Workflows now:

• Copy the runner’s existing Docker configuration into a job-temporary directory.
• Remove auths, credsStore, and credHelpers from the copied configuration.
• Preserve proxy, buildx, and other non-authentication settings.
• Avoid reading from or modifying the runner’s persistent Docker login during the build.

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[hguillen]

I don't think you need this if you are doing the cusstom folder in line 67. the docker comand should use the docker config file though, using --config ${DOCKER_CONFIG} or so

[peterd-NV]

I think the copy here is intentional for preserving the runner’s proxy/build settings while removing any login credentials that was causing the image pull failure. The empty config was potentially causing network failures during Docker builds so this one puts any existing network configs back in.