customRoleDefinition.json

{
   "Name": "Virtual Machine Operator (Custom)",
   "Id": null,
   "IsCustom": true,
   "Description": "Allows to start and stop (deallocate) Azure VMs",
   "Actions": [
       "Microsoft.Compute/*/read",
       "Microsoft.Compute/virtualMachines/deallocate/action",
       "Microsoft.Compute/virtualMachines/start/action"
   ],
   "NotActions": [
   ],
   "AssignableScopes": [
       "/subscriptions/SUBSCRIPTION_ID"
   ]
}