wip using ansible provisioner.

util/packer/ben_jenkins_worker.json

+{
+  "variables": {
+    "aws_access_key": "{{env `AWS_ACCESS_KEY_ID`}}",
+    "aws_secret_key": "{{env `AWS_SECRET_ACCESS_KEY`}}",
+    "playbook_remote_dir": "/tmp/packer-edx-playbooks",
+    "ami": "{{env `JENKINS_WORKER_AMI`}}",
+    "test_platform_version": "{{env `TEST_PLATFORM_VERSION`}}"
+  },
+  "builders": [{
+    "type": "amazon-ebs",
+    "access_key": "{{user `aws_access_key`}}",
+    "secret_key": "{{user `aws_secret_key`}}",
+    "ami_name": "jenkins_worker-{{isotime | clean_ami_name}}",
+    "instance_type": "m3.large",
+    "region": "us-east-1",
+    "source_ami": "{{user `ami`}}",
+    "ssh_username": "ubuntu",
+    "ami_description": "jenkins worker",
+    "iam_instance_profile": "jenkins-worker",
+    "security_group_id": "sg-75af5e18"
+  }],
+  "provisioners": [{
+    "type": "shell",
+    "inline": ["rm -rf {{user `playbook_remote_dir`}}",
+      "mkdir {{user `playbook_remote_dir`}}"]
+  }, {
+        "type": "file",
+        "source": "../../playbooks/run_role.yml",
+        "destination": "{{user `playbook_remote_dir`}}/run_role.yml"
+  }, {
+    "type": "file",
+    "source": "../../playbooks/roles",
+    "destination": "{{user `playbook_remote_dir`}}/roles"
+  }, {
+      "type": "file",
+      "source": "../../playbooks/edx-east",
+      "destination": "{{user `playbook_remote_dir`}}/edx-east"
+  }, {
+    "type": "file",
+    "source": "../../requirements.txt",
+    "destination": "{{user `playbook_remote_dir`}}/requirements.txt"
+  }, {
+    "type": "shell",
+    "inline": ["sudo add-apt-repository ppa:git-core/ppa -y"]
+  }, {
+    "type": "shell",
+    "inline": ["sudo apt-get update"]
+  }, {
+    "type": "shell",
+    "inline": ["sudo apt-get -y install git-core"]
+  }, {
+    "type": "shell",
+    "inline": ["sudo apt-get -y install libmysqlclient-dev"]
+  }, {
+    "type": "shell",
+    "inline": ["cd {{user `playbook_remote_dir`}}",
+      "virtualenv packer-venv",
+      ". packer-venv/bin/activate",
+      "pip install -q -r requirements.txt"]
+  }, {
+    "type": "ansible-local",
+    "playbook_file": "../../playbooks/run_role.yml",
+    "playbook_dir": "../../playbooks",
+    "command": "source {{user `playbook_remote_dir`}}/packer-venv/bin/activate && ansible-playbook",
+    "inventory_groups": "jenkins_worker",
+    "extra_arguments": [
+      "-e \"role=test_build_server test_edx_platform_version={{user `test_platform_version`}}\"",
+      "-vvv"
+      ]
+
+  }, {
+    "type": "shell",
+    "inline": ["cd {{user `playbook_remote_dir`}}",
+      "rm -rf packer-venv",
+      "virtualenv packer-venv",
+      ". packer-venv/bin/activate",
+      "pip install -q -r requirements.txt",
+      "ansible-playbook run_role.yml -i inventory.ini -c local -e role=test_build_server -vvvv"]
+  }]
+}