docker: explicitly install NCCL in CUDA 13 images - #28143
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NCCL is no longer pre-installed in CUDA >= 13 images, which disables `GGML_CUDA_NCCL`. Install `libnccl-dev` at build time and `libnccl2` in the runtime image.
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Overview
NCCL is no longer pre-installed in CUDA >= 13 images, which disables
GGML_CUDA_NCCL. Installlibnccl-devat build time andlibnccl2in the runtime image.Requirements