Compose file top-level element name is not recognized

[nicomem]

Description

When using the podlet compose command on a compose file which has a name top level element, an error is thrown indicating that the file is not a valid compose file.

Steps to reproduce

Create the following compose file hello-world-compose.yml:

version: '3'
name: hello-world
services:
  hello-world:
    image: hello-world

Run podlet compose hello-world-compose.yml:

Error: 
   0: File `hello-world-compose.yml` is not a valid compose file
   1: unknown attribute "name", extensions must start with 'x-' (see https://docs.docker.com/compose/compose-file/#extension)

[k9withabone]

Blocked on #63.