* feat(gpu): Ubuntu NVIDIA GPU node image + GPU AMI selection
Epic A of GPU passthrough to EKS pods / ECS task containers.
- Add gpu-vendor AMI tag constants + GPUVendorForType/IsGPUTypeName helpers
(instance-family prefix -> vendor from knownGPUModels).
- EKS + ECS worker AMI resolution branches to a GPU-tagged node image for GPU
instance types; no fallback to the driverless image (hard error instead).
- Exclude gpu-vendor-tagged AMIs from the plain (non-GPU) lookup so a newer GPU
AMI cannot hijack ordinary nodes (managed-by tag is shared; filters have no
negation, so exclude client-side).
- NodegroupRecord caches GPUEnabled/GPUVendor from InstanceTypes.
- Catalog entries spinifex-eks-node-gpu / spinifex-ecs-node-gpu (dual-tagged).
- New Ubuntu 26.04 GPU node images (eks-node-gpu, ecs-agent-gpu): reuse the
proven DKMS -server driver recipe (drop Docker CE + dev payload), add
nvidia-container-toolkit, OpenRC->systemd port of the worker/agent service
subset, udev EBS by-id bridge, nvidia modules-load, first-boot CDI generation.
- build-system-image.sh: SYSTEM_TAG supports multiple space-separated tags.
* build: allow SYSTEM_IMAGE_BUILD_DIR override for image build dir
Ubuntu GPU images are 16G; a RAM-backed /tmp tmpfs is too small to hold the
qcow2 + expanded raw. Default stays /tmp; SYSTEM_IMAGE_BUILD_DIR redirects the
build onto a real disk.
Josh Siviour