Added the ability to add code to a job in a workflow

[sebprt]

version: '0.3'
satellites:
  akeneo_to_csv_test:
    label: 'Export into csv'
    filesystem:
      path: build
    workflow:
      name: 'Akeneo to csv'
      jobs:
        - code: 'extract_products_from_akeneo_to_csv' # possibilité d'ajouter un code a un job
          pipeline:
            name: 'Extract products from Akeneo'
```yaml