updated.yaml

inputs:
  username:
    type: string
    title: Username
resources:
  web1:
    type: Cloud.Machine
    networks:
      - name: '${Cloud_Network_1.name}'
    properties:
      count: 1
      image: Ubuntu
      constraints:
        - tag: 'cloud:vsphere'
      flavor: medium
      cloudConfig: |
        #cloud-config
        runcmd: 
          - "echo ${input.username} ALL=(ALL) ALL'>>/etc/sudoers"
      networks:
        - name: '${AppNetwork.name}'
  AppNetwork:
    type: Cloud.Network
    properties:
      name: Core
      networkType: existing