build: AUT-1619 install NCCL gIB plugin in CI image

[svcnemo-autobot]

Background

The r0.6.0 CI image needs Google Cloud’s NCCL gIB plugin while keeping automatic NCCL network-plugin selection disabled.

What changed

Configures Google’s signed apt repository and installs exactly nccl-gib-plugins=1.1.2-1. Sets NCCL_NET_PLUGIN=none as the final Dockerfile instruction.

Details

flowchart LR
  A[Signed apt repository] --> B[Pinned gIB package]
  B --> C[Image build]
  C --> D[NCCL_NET_PLUGIN=none]

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Tested

• Verified the requested apt command and exact package version
• Verified ENV NCCL_NET_PLUGIN=none occurs once and is the final Dockerfile instruction
• Verified the effective final environment value is none
• Full image validation remains pending commit approval and CI

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