feat: adds measured boot recipe

[fnerdman]

No description provided.

[fnerdman]

This is WIP, tried to make it run after the wic image is created but I haven't had full success.

[fnerdman]

the measurements.json file that will be consumed by the reverse proxy attestation client needs to look like this:

{
  "4": {
    "expected": "3d458cfe55cc03ea1f443f1562...",
    "warnOnly": false
  },
  "9": {
    "expected": "8df51c75e14a9fcf9a7234a13f1...",
    "warnOnly": false
  },
  "11": {
    "expected": "cc03ea1f443f1562beec8df51c...",
    "warnOnly": false
  }
}