Support for multiple instance types

[ErinWeisbart]

h/t @emiglietta

In config:
MACHINE_TYPE = ['m5.xlarge','c5.xlarge','c4.xlarge']

(make sure that the MEMORY allocated to the containers is compatible with all machine types)

In the fleet file, triplicate the multi-subnet ‘Launch specification’ block (current DCP walks through the list of instances in the config file and matches each one with a launch specification):

{
  "IamFleetRole": "arn:aws:iam::XXXXXXXXX:role/aws-ec2-spot-fleet-tagging-role",
  "AllocationStrategy": "lowestPrice",
  "TerminateInstancesWithExpiration": true,
  "LaunchSpecifications": [
    {
      "ImageId": "ami-0ce03502c5bb5e188",
      "SubnetId": "subnet-AAAAAAAAA, subnet-BBBBBBBBB, subnet-CCCCCCCCC, subnet-DDDDDDDDD",
      "KeyName": "KEYNAME",
      "IamInstanceProfile": {
        "Arn": "arn:aws:iam::XXXXXXXXX:instance-profile/ecsInstanceRole"
      },
      "SecurityGroups": [
        {
          "GroupId": "sg-ZZZZZZZZZ"
        }
      ],
      "BlockDeviceMappings": [
        {
          "DeviceName": "/dev/xvda",
          "Ebs": {
            "DeleteOnTermination": true,
            "VolumeType": "gp3",
            "VolumeSize": 24,
            "SnapshotId": "snap-0a7b4ece894d62882"
          }
        },
        {
          "DeviceName": "/dev/xvdcz",
          "Ebs": {
            "DeleteOnTermination": true,
            "VolumeType": "gp3"
          }
        }
      ]
    },
    {
      "ImageId": "ami-0ce03502c5bb5e188",
      "SubnetId": "subnet-AAAAAAAAA, subnet-BBBBBBBBB, subnet-CCCCCCCCC, subnet-DDDDDDDDD",
      "KeyName": "KEYNAME",
      "IamInstanceProfile": {
        "Arn": "arn:aws:iam::XXXXXXXXX:instance-profile/ecsInstanceRole"
      },
      "SecurityGroups": [
        {
          "GroupId": "sg-ZZZZZZZZZ"
        }
      ],
      "BlockDeviceMappings": [
        {
          "DeviceName": "/dev/xvda",
          "Ebs": {
            "DeleteOnTermination": true,
            "VolumeType": "gp3",
            "VolumeSize": 24,
            "SnapshotId": "snap-0a7b4ece894d62882"
          }
        },
        {
          "DeviceName": "/dev/xvdcz",
          "Ebs": {
            "DeleteOnTermination": true,
            "VolumeType": "gp3"
          }
        }
      ]
    },
    {
      "ImageId": "ami-0ce03502c5bb5e188",
      "SubnetId": "subnet-AAAAAAAAA, subnet-BBBBBBBBB, subnet-CCCCCCCCC, subnet-DDDDDDDDD",
      "KeyName": "KEYNAME",
      "IamInstanceProfile": {
        "Arn": "arn:aws:iam::XXXXXXXXX:instance-profile/ecsInstanceRole"
      },
      "SecurityGroups": [
        {
          "GroupId": "sg-ZZZZZZZZZ"
        }
      ],
      "BlockDeviceMappings": [
        {
          "DeviceName": "/dev/xvda",
          "Ebs": {
            "DeleteOnTermination": true,
            "VolumeType": "gp3",
            "VolumeSize": 24,
            "SnapshotId": "snap-0a7b4ece894d62882"
          }
        },
        {
          "DeviceName": "/dev/xvdcz",
          "Ebs": {
            "DeleteOnTermination": true,
            "VolumeType": "gp3"
          }
        }
      ]
    }
  ],
  "Type": "maintain"
}