Ansible Tower AWS Workshop | cannot be deployed in us-east-1e without changing instance types

[dmc5179]

When attempting to deploy the workshop in us-east-1 the provisioning fails if the availability zone gets set to us-east-1e and the instance sizes are left as the defaults:

fatal: [localhost]: FAILED! => {"changed": false, "msg": "Instance creation failed => Unsupported: Your requested instance type (t3.small) is not supported in your requested Availability Zone (us-east-1e). Please retry your request by not specifying an Availability Zone or choosing us-east-1a, us-east-1b, us-east-1c, us-east-1d, us-east-1f."}

[dmc5179]

My understanding of AZs in AWS is that they are randomized by account so we probably need to add an option that allows for setting the AZ.