switched to jq for parsing json responses

Jenkinsfile

@@ -108,21 +108,17 @@ pipeline {
                             waitUntil {
                                 sleep(time: 10, unit: 'SECONDS')
 
-                                // Query OPNSense DHCP leases API
-                                def response = sh(
+                                // Query OPNSense DHCP leases API and parse with jq
+                                vmIp = sh(
                                     script: """
                                         curl -s -k -u "\${OPNSENSE_KEY}:\${OPNSENSE_SECRET}" \
-                                            "https://${OPNSENSE_HOST}/api/dhcpv4/leases/searchLease"
+                                            "https://${OPNSENSE_HOST}/api/dhcpv4/leases/searchLease" | \
+                                        jq -r '.rows[] | select(.hostname == "${templateHost}" or .["client-hostname"] == "${templateHost}") | .address' | head -1
                                     """,
                                     returnStdout: true
                                 ).trim()
 
-                                // Parse JSON and find the lease with matching hostname
-                                def leases = readJSON text: response
-                                def matchingLease = leases.rows?.find { it.hostname == templateHost || it['client-hostname'] == templateHost }
-
-                                if (matchingLease) {
-                                    vmIp = matchingLease.address
+                                if (vmIp) {
                                     echo "Found IP address: ${vmIp} for hostname: ${templateHost}"
                                     return true
                                 }