packer-cn/packer/test-fixtures/build-ignore-template-variable.json

{
    "variables": {
        "var": "{{env `PACKER_TEST_ENV`}}_{{ .PACKER_TEST_TEMP }}",
        "http_ip": "{{ .HTTPIP }}",
        "array_var": "us-west-1,us-west-2"
    },

    "builders": [{
        "type": "test"
    }]
}