The NVIDIA CUDA HTTPS apt source (developer.download.nvidia.com) may be
unreachable from inside the live-build container chroot, causing
'E: Unable to locate package datacenter-gpu-manager-4-cuda13'.
Add build-dcgm.sh that downloads DCGM and nvidia-fabricmanager .deb
packages on the build host (verifying SHA256 against Packages.gz) and
caches them in BEE_CACHE_DIR. build.sh (step 25-dcgm, nvidia only)
copies them into LB_DIR/config/packages.chroot/ before lb build, so
live-build creates a local apt repo from them. The chroot installs the
packages from the local repo without ever contacting the NVIDIA CUDA
HTTPS source.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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