fix: point trustee at feature branch for baremetal attestation testing

Temporarily uses butler54/trustee-chart feature/baremetal-attestation
branch instead of released chart. This branch includes:
- Baremetal TDX and SNP attestation rules
- Conditional pcr-stash (no error on baremetal without vTPM)
- Raw init_data hash (zero-padded) for baremetal attestation
- TDX QCNL config with use_secure_cert: false for local PCCS

Revert to chartVersion after merging and releasing trustee chart.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: butler54

values-baremetal.yaml

@@ -106,8 +106,9 @@ clusterGroup:
       name: trustee
       namespace: trustee-operator-system
       project: trustee
-      chart: trustee
-      chartVersion: 0.3.*
+      repoURL: https://github.com/butler54/trustee-chart.git
+      targetRevision: feature/baremetal-attestation
+      path: .
       overrides:
         - name: global.coco.secured
           value: "true"