Advanced reservations

Use HW_* variables when tags are not specific enough.

Tags select eligible capacity. Variables request concrete resources for this job.

Common variables

Variable	Use
`HW_CPU`	Override the CPU count inferred from the SaaS tag.
`HW_MEMORY`	Override the memory inferred from the SaaS tag.
`HW_GPU_COUNT`	Reserve a specific number of GPUs.
`HW_GPU_MODEL`	Request a specific GPU model.
`HW_NIC_TIER`	Reserve a NIC tier such as `25g`.
`HW_NIC_DRIVER`	Request a NIC driver such as `mlx5_core`.
`HW_SRIOV_VF_COUNT`	Reserve SR-IOV virtual functions.
`HW_NUMA_POLICY`	Use `any`, `single-node`, or `spread`.
`HW_HUGEPAGE_BYTES`	Reserve hugepage bytes.
`HW_PREEMPTIBLE`	Allow preemptible capacity for generic jobs.
`HW_PLACEMENT`	Use `auto`, `bare-metal`, or `cloud`.

Example

packet-test:
  tags:
    - saas-linux-large-amd64
    - nic:tier:25g
  variables:
    HW_CPU: "8"
    HW_MEMORY: "16Gi"
    HW_NIC_TIER: "25g"
    HW_SRIOV_VF_COUNT: "1"
    HW_NUMA_POLICY: "single-node"
  script:
    - ./run_packet_test.sh