[Feature Request] Add datacenter tag in Upstream Stanza

[CarelvanHeerden]

Nomad version

0.12.4

Operating system and Environment details

Ubuntu 18.04
Consul 18.4

Issue

No ability to specify the secondary datacenter in the Upstream stanza, to get upstream proxy to connect to service via mesh_gateway.

When specifying a Service in Consul, you have an extra tag to specify that the service is located in another DC

Example:

service {
  name = "web",
  port = 8080,
  token = "<token here>",
  connect {
    sidecar_service {
      proxy {
        upstreams = [
          {
            destination_name = "socat",
            datacenter = "primary",
            local_bind_port = 8181
          }
        ]
      }
    }
  }
}

However, this is not possible in the Nomad service definition.

Parse Error
error parsing 'job': group: 'example', service (0): 'example', sidecar_service, proxy, 1 error occurred: * upstream -> invalid key: datacenter

job "example" {
  datacenters = ["GENERAL"]
  region = "sa"
  group "tms" {
    count = 1
   
    network {
      mode = "bridge"
    }
    service {
      name = "example"
      port = "8681"
      connect {
        sidecar_service {
          proxy {
            upstreams {
              local_bind_port = 8556
              datacenter = "secondary",
              destination_name = "example2"
            }
          }
        }
      }

[github-actions]

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