nuke deadline submit with environ var from presets overrides

[jakubjezek001]

description

At the moment we are not able to add any additional environment variables or override some we already have, but they need to be having different values for deadline workers. For example, if we want to have different licensing.

required for testing:

Add this to your pype-config\repos\pype-config\presets\plugins\nuke\publish.json

{
    "NukeSubmitDeadline": {
        "env_overrides": {
            "TESTENV": "testenv value",
            "FTRACK_SERVER": "overriding this key with this value"
        }
    }
}