Update sampleec2.tf

1 job for master in 13 seconds (queued for 1 second)
Status Job ID Name Coverage
  Provision
failed #61204
rr
provision

00:00:13

 
Name Stage Failure
failed
provision Provision
 
on samplerole.tf line 22, in resource "aws_iam_role" "role_name":
22: name = var.role_ec2

An input variable with the name "role_ec2" has not been declared. This
variable can be declared with a variable "role_ec2" {} block.

Cleaning up project directory and file based variables
ERROR: Job failed: exit status 1