API: set environment variables at application creation

When you create an application with the Clever Cloud API, you can now set environment variables directly. This feature is available in the POST v2/organisations/{id}/applications endpoint, with an object to set:

"env": {
    "ENV_VAR": "value",
    "ANOTHER_ENV_VAR": "another value"
}

The response will contain an env object, with the environment variables set:

"env": [
{
  "name": "ENV_VAR",
  "value": "value"
},
{
  "name": "ANOTHER_ENV_VAR",
  "value": "another value"
}]

You can get this object from the applications endpoints, such as GET v2/organisations/{id}/applications/{appId}.