Define jenkins flyweight worker for running flow jobs

playbooks/edx-east/jenkins_worker_flyweight.yml

+# Configure a Jenkins flyweight worker instance
+# This does not need to run platform tests, it will
+# run only flyweight (e.g. flow) jobs.
+
+- name: Configure instance(s)
+  hosts: jenkins_worker
+  become: True
+  gather_facts: True
+  vars:
+    serial_count: 1
+    COMMON_SECURITY_UPDATES: yes
+    SECURITY_UPGRADE_ON_ANSIBLE: true
+  serial: "{{ serial_count }}"
+  roles:
+    - aws
+    - jenkins_worker

util/packer/jenkins_worker_flyweight.json

+{
+  "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`}}",
+    "security_group": "{{env `AWS_SECURITY_GROUP`}}",
+    "delete_or_keep": "{{env `DELETE_OR_KEEP_AMI`}}",
+    "remote_branch": "{{env `REMOTE_BRANCH`}}",
+    "jenkins_worker_key_url": "{{env `JENKINS_WORKER_KEY_URL`}}"
+  },
+  "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 flyweight",
+    "iam_instance_profile": "jenkins-worker",
+    "security_group_id": "{{user `security_group`}}",
+    "tags": {
+      "delete_or_keep": "{{user `delete_or_keep`}}"
+    },
+    "launch_block_device_mappings": [{
+      "delete_on_termination": true,
+      "device_name": "/dev/sda1",
+      "volume_size": "40",
+      "volume_type": "gp2"
+    }]
+  }],
+  "provisioners": [{
+    "type": "shell",
+    "inline": ["rm -rf {{user `playbook_remote_dir`}}",
+      "mkdir {{user `playbook_remote_dir`}}"]
+  }, {
+    "type": "file",
+    "source": "stop-automatic-updates.sh",
+    "destination": "{{user `playbook_remote_dir`}}/stop-automatic-updates.sh"
+  }, {
+    "type": "file",
+    "source": "../../util/install/ansible-bootstrap.sh",
+    "destination": "{{user `playbook_remote_dir`}}/ansible-bootstrap.sh"
+  }, {
+    "type": "shell",
+    "inline": ["cd {{user `playbook_remote_dir`}}",
+      "export CONFIGURATION_VERSION='{{user `remote_branch`}}'",
+      "sudo bash ./stop-automatic-updates.sh",
+      "sudo bash ./ansible-bootstrap.sh" ]
+  }, {
+    "type": "ansible-local",
+    "playbook_file": "../../playbooks/edx-east/jenkins_worker_flyweight.yml",
+    "playbook_dir": "../../playbooks",
+    "command": ". {{user `venv_dir`}}/bin/activate && ansible-playbook",
+    "inventory_groups": "jenkins_worker",
+    "extra_arguments": [
+      "-e \"NEWRELIC_LICENSE_KEY={{user `new_relic_key`}} jenkins_worker_key_url='{{user `jenkins_worker_key_url`}}'\"",
+      "-vvv"
+      ]
+  }]
+}