Add profile query param

[bmcdonald3]

This PR implements phase 2 of the plan outlined in OpenCHAMI/roadmap#121 by adding a profile query param.

To test, first a "Default" configuration that points to the stable kernel is created.

$ go run ./cmd/client/main.go bootconfiguration create --spec '{"kernel":"http://boot.server/vmlinuz-stable", "params":"console=tty0", "hosts":["x1000c0s0b0n0"]}'
{
  "apiVersion": "v1",
  "kind": "BootConfiguration",
  "schemaVersion": "v1",
  "metadata": {
    "name": "",
    "uid": "boo-248b33d3",
    "createdAt": "2026-02-02T10:42:46.100635-08:00",
    "updatedAt": "2026-02-02T10:42:46.100635-08:00"
  },
  "spec": {
    "hosts": [
      "x1000c0s0b0n0"
    ],
    "kernel": "http://boot.server/vmlinuz-stable",
    "params": "console=tty0"
  },
  "status": {}
}

Next, a "Staging" configuration is added that points to the beta kernel, tagged with profile: staging.

$ go run ./cmd/client/main.go bootconfiguration create --spec '{"kernel":"http://boot.server/vmlinuz-beta", "params":"console=tty0", "hosts":["x1000c0s0b0n0"], "profile":"staging"}'
{
  "apiVersion": "v1",
  "kind": "BootConfiguration",
  "schemaVersion": "v1",
  "metadata": {
    "name": "",
    "uid": "boo-5034631c",
    "createdAt": "2026-02-02T10:42:52.153509-08:00",
    "updatedAt": "2026-02-02T10:42:52.153509-08:00"
  },
  "spec": {
    "hosts": [
      "x1000c0s0b0n0"
    ],
    "profile": "staging",
    "kernel": "http://boot.server/vmlinuz-beta",
    "params": "console=tty0"
  },
  "status": {}
}

Then, the node is registered so the Boot Service can resolve the XName.

$ go run ./cmd/client/main.go node create --spec '{"xname":"x1000c0s0b0n0", "nid":1000, "bootMac":"00:11:22:33:44:55"}'
{
  "apiVersion": "v1",
  "kind": "Node",
  "schemaVersion": "v1",
  "metadata": {
    "name": "",
    "uid": "nod-c0b9171c",
    "createdAt": "2026-02-02T10:43:35.000814-08:00",
    "updatedAt": "2026-02-02T10:43:35.000814-08:00"
  },
  "spec": {
    "xname": "x1000c0s0b0n0",
    "nid": 1000,
    "bootMac": "00:11:22:33:44:55"
  },
  "status": {}
}

Test A: Default Boot (No Profile)

Boot script requested without specifying a profile. The service correctly serves the stable kernel.

$ curl "http://localhost:8080/boot/v1/bootscript?host=x1000c0s0b0n0"
#!ipxe
# iPXE Boot Script
# Generated by OpenCHAMI Boot Service
# Node: x1000c0s0b0n0 (NID: 1000)
# Configuration:
# Role:

echo Starting boot for x1000c0s0b0n0
echo Using configuration:
echo Role:

# Configure network interface
dhcp

# Set boot parameters
set kernel http://boot.server/vmlinuz-stable
set params console=tty0

# Download and verify kernel
echo Downloading kernel: vmlinuz-stable
kernel ${kernel} ${params}

# Boot the system
echo Booting x1000c0s0b0n0...
boot

Test B: Staging Boot (Sticky Profile)

Boot script requested with ?profile=staging. The service correctly identifies the override and serves the beta kernel.

$ curl "http://localhost:8080/boot/v1/bootscript?host=x1000c0s0b0n0&profile=staging"
#!ipxe
# iPXE Boot Script
# Generated by OpenCHAMI Boot Service
# Node: x1000c0s0b0n0 (NID: 1000)
# Configuration:
# Role:

echo Starting boot for x1000c0s0b0n0
echo Using configuration:
echo Role:

# Configure network interface
dhcp

# Set boot parameters
set kernel http://boot.server/vmlinuz-beta
set params console=tty0

# Download and verify kernel
echo Downloading kernel: vmlinuz-beta
kernel ${kernel} ${params}

# Boot the system
echo Booting x1000c0s0b0n0...
boot

[alexlovelltroy]

merging this on top of the updates in #7 wasn't going to be pretty. I've moved the functionality across.