Populate environment variables and go
"cluster": "{{env `VSPHERE_CLUSTER`}}",
"datacenter": "{{env `VSPHERE_DATACENTER`}}",
"datastore": "{{env `VSPHERE_DATASTORE`}}",
"folder": "{{env `VSPHERE_FOLDER`}}",
"iso_path": "{{env `VSPHERE_ISO_PATH`}}",
"packer_bastion_host": "{{env `PACKER_BASTION_HOST`}}",
"packer_bastion_key": "{{env `PACKER_BASTION_KEY`}}",
"password": "{{env `VSPHERE_PASSWORD`}}",
"template_name": "{{env `VSPHERE_TEMPLATE_NAME`}}",
"template_network": "{{env `VSPHERE_NETWORK`}}",
"vcenter_server": "{{env `VSPHERE_SERVER`}}",
"vcenter_username": "{{env `VSPHERE_USERNAME`}}"