feat: add support for configuring runner worker root device name #1140
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Description
These changes add support for configuring the root device name for the Docker Machine instances. This is necessary when using an Amazon Linux AMI where the default device name of
/dev/sda1
ends up creating a 2nd, unused, non-root volume.https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/device_naming.html#available-ec2-device-names
Closes #1154
Verification
Confirmed root device on Docker Machine instances is correctly configured in both fleet-mode and non-fleet mode when using an AL2 AMI. Checked this in AWS Console.