Add measurements format conversion helper (#161)

Author: pablin-10

scripts/gcp_measurements_to_dcap.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# TEMPORARY: reshape dstack-mr GCP measurements (make measure-gcp ->
+# build/gcp_measurements.json) into cvm-reverse-proxy's dcap-tdx
+# --server-measurements format. Drop once cvm-reverse-proxy accepts the
+# condensed dstack-mr output directly.
+#
+# dstack-mr emits mrtd[] (one per known GCP firmware) and rtmr0[] (equal-size
+# per-firmware chunks: firmware x machine-type-ACPI x boot variants), while
+# cvm-reverse-proxy wants flat measurement sets it ORs over. We pair mrtd[i]
+# with its rtmr0 chunk; a genuine quote matches exactly one set.
+#
+# Usage: scripts/gcp_measurements_to_dcap.sh [gcp_measurements.json] > out.json
+set -euo pipefail
+jq '
+  (.mrtd | length) as $m
+  | (((.rtmr0 | length) / $m) | floor) as $c
+  | [ range(0; $m) as $i
+    | range(0; $c) as $j
+    | { measurement_id: "local fw\($i)-v\($j)",
+        attestation_type: "dcap-tdx",
+        measurements: {
+          "0": { expected: .mrtd[$i] },
+          "1": { expected: .rtmr0[$i*$c + $j] },
+          "2": { expected: .rtmr1 },
+          "3": { expected: .rtmr2 },
+          "4": { expected: .rtmr3 }
+        } } ]
+' "${1:-build/gcp_measurements.json}"