curl --request POST \
  --url https://api.wacht.dev/workspaces/{id}/members/{membershipId}/roles/{roleId}/add \
  --cookie session_id=

{
  "id": "333333333333333333",
  "workspace_id": "123456789012345678",
  "organization_membership_id": "777777777777777777",
  "user_id": "555555555555555555",
  "created_at": "2024-01-15T10:30:00Z",
  "updated_at": "2024-01-15T10:30:00Z"
}