Disallow passing input that is not apart of the optionset

[Emyrk]

If options are provided, these are the only valid options that can inputted.

If the input value is not apart of the optionset, throw an error.

Try to mimic behavior of terraform apply

Default value is invalid, or passed in via user: preview -v region=asia

data "coder_parameter" "region" {
  name        = "region"
  description = "Which region would you like to deploy to?"
  type        = "string"
  default     = "aus"
  order       = 1

  option {
    name  = "Europe"
    value = "eu"
  }
  option {
    name  = "United States"
    value = "us"
  }
}

╷
│ Error: default value "aus" must be defined as one of options
│ 
│   with data.coder_parameter.region2,
│   on main.tf line 45, in data "coder_parameter" "region2":
│   45: data "coder_parameter" "region2" {
│ 
╵

Add the diagnostic in the parameter function:

preview/extract/parameter.go

Line 16 in 48003cd

func ParameterFromBlock(block *terraform.Block) (*types.Parameter, hcl.Diagnostics) {

What about this???

data "coder_parameter" "region" {
  name        = "region"
  description = "Which region would you like to deploy to?"
  type        = "string"
  default     = "aus"
  order       = 1

  option {
    name  = "Default"
    value = data.coder_parameter.region.default
  }
}

[Emyrk]

Also do this for multi-select options