chore: finalize resource retirement release verification

scripts/orbit-local.py

@@ -97,6 +97,7 @@ def setup():
     values['ORBIT_CREDENTIAL_VAULT_INITIALIZED'] = '1'
     values['ORBIT_BUILD_REVISION'] = subprocess.check_output(
         ['git', 'rev-parse', 'HEAD'], cwd=ROOT, text=True).strip()
+    values['ORBIT_BUILD_TIME'] = datetime.datetime.now(datetime.timezone.utc).strftime('%Y-%m-%dT%H:%M:%SZ')
     save_settings(values)
     compose('config', '--quiet')
     compose('build', 'orbit')