[juliosueiras]

it will make more sense with something like

  data "template_file" "eth_service" {
    	filename = "./files/eth.service"
  	vars {
  		wallet_address = 
  "${var.wallet_address}"
  	}
  
  }

with

ExecStart=/tmp/ethminer -G -F eth-us.dwarfpool.com:80/${wallet_address}