There is a new and easy way to get a SOA Suite environment up and running without downloading any installers in only a couple of commands without depending on scripts provided by any party other than Oracle. The resulting environment is an Oracle Enterprise Edition database, an Admin Server and a Managed Server. All of them running in separate Docker containers with ports exposed to the host. The 3 containers can run together within an 8Gb VM.
The documentation Oracle provides in its Container Registry for the SOA Suite images, should be used as base, but since you will encounter some errors if you follow it, you can use this blog post to help you solve them quickly.