Format github comment as hcl

[lijok]

Github supports hcl formatting by encapsulating code blocks with ```hcl

without:

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  + create
 <= read (data resources)

Terraform will perform the following actions:

  # module.state.aws_dynamodb_table.state_file_locking_table will be created
  + resource "aws_dynamodb_table" "state_file_locking_table" {
      + arn              = (known after apply)
      + billing_mode     = "PROVISIONED"
      + hash_key         = "LockID"
      + id               = (known after apply)
      + name             = "staging-terraform-state"
      + read_capacity    = 20
      + stream_arn       = (known after apply)
      + stream_label     = (known after apply)
      + stream_view_type = (known after apply)
      + write_capacity   = 20

      + attribute {
          + name = "LockID"
          + type = "S"
        }

      + point_in_time_recovery {
          + enabled = (known after apply)
        }

      + server_side_encryption {
          + enabled     = (known after apply)
          + kms_key_arn = (known after apply)
        }
    }

with:

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  + create
 <= read (data resources)

Terraform will perform the following actions:

  # module.state.aws_dynamodb_table.state_file_locking_table will be created
  + resource "aws_dynamodb_table" "state_file_locking_table" {
      + arn              = (known after apply)
      + billing_mode     = "PROVISIONED"
      + hash_key         = "LockID"
      + id               = (known after apply)
      + name             = "staging-terraform-state"
      + read_capacity    = 20
      + stream_arn       = (known after apply)
      + stream_label     = (known after apply)
      + stream_view_type = (known after apply)
      + write_capacity   = 20

      + attribute {
          + name = "LockID"
          + type = "S"
        }

      + point_in_time_recovery {
          + enabled = (known after apply)
        }

      + server_side_encryption {
          + enabled     = (known after apply)
          + kms_key_arn = (known after apply)
        }
    }

I would raise a pr but I saw in one of the issues that you guys try to support platforms other than github as well and I'm not sure if this applies to other platforms

Thanks

[Alex Jurkiewicz]

I would love this! I don't think you need to worry about non-github compatibility because the action is entirely specialised towards posting on github PR comments.