DCD-1123: Add roles to support creating multiple basic EC2 instances into a VPC.

roles/ec2-instance/defaults/main.yml

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+---
+
+ec2_ami_owner: "amazon"
+ec2_ami_description: "Amazon Linux 2 AMI 2.0.* x86_64 HVM gp2"
+ec2_type: "t3a.xlarge"
+ec2_disk_size: "512"
+ec2_keypair: "taskcat-ci-key"
+

roles/ec2-instance/tasks/main.yml

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+---
+
+- name: Fetch AMI list for region
+  ec2_ami_facts:
+    region: "{{ aws_region }}"
+    owner: "{{ ec2_ami_owner }}"
+    filters:
+      description: "{{ ec2_ami_description }}"
+  register: amis
+
+- name: Find the latest version of the AMI
+  set_fact:
+    latest_ami: "{{ amis.images | selectattr('name', 'defined') | sort(attribute='creation_date') | last }}"
+
+- name: Provision EC2 host
+  ec2:
+    exact_count: 1
+    count_tag:
+      Name: "{{instance_name}}"
+    keypair: "{{ ec2_keypair }}"
+    region: "{{ aws_region }}"
+    instance_type: "{{ ec2_type }}"
+    image: "{{ latest_ami.image_id }}"
+    group_id: "{{ sg.group_id }}"
+    vpc_subnet_id: "{{ subnet.subnet.id }}"
+    assign_public_ip: True
+    volumes:
+      - device_name: /dev/xvda
+        volume_type: gp2
+        volume_size: "{{ ec2_disk_size }}"
+    wait: true
+    instance_tags:
+      Name: "{{ instance_name }}"
+      name: "{{ instance_name }}"
+      business_unit: "{{ business_unit }}"
+      service_name: "{{ instance_name}}"
+      resource_owner: "{{ resource_owner }}"
+  register: ec2_instance