Add default USER's role when creating a new user

[chrispinkney]

i.e.,

model User {
  ...
  role    Role    @default(USER)
  ...
}

  async createUser(createUser: CreateUserDto) {
    return await this.prisma.user.create({
      data: {
        ...createUser,
        id: uuidv4(),
        role: Role.USER, // <-- remove/change this to let prisma assign a role?
      },
    });
  }