hotfix: jenkins_worker_loadtest.json was missing newrelic keys

util/packer/jenkins_worker_loadtest.json

@@ -2,6 +2,7 @@
   "variables": {
     "aws_access_key": "{{env `AWS_ACCESS_KEY_ID`}}",
     "aws_secret_key": "{{env `AWS_SECRET_ACCESS_KEY`}}",
+    "new_relic_key": "{{env `NEW_RELIC_KEY`}}",
     "playbook_remote_dir": "/tmp/packer-edx-playbooks",
     "venv_dir": "/edx/app/edx_ansible/venvs/edx_ansible",
     "ami": "{{env `JENKINS_WORKER_AMI`}}",
@@ -48,6 +49,9 @@
     "playbook_dir": "../../playbooks",
     "command": ". {{user `venv_dir`}}/bin/activate && ansible-playbook",
     "inventory_groups": "jenkins_worker",
-    "extra_arguments": [ "-vvv" ]
+    "extra_arguments": [
+      "-e \"NEWRELIC_LICENSE_KEY={{user `new_relic_key`}}\"",
+      "-vvv"
+    ]
   }]
 }