chore: add form_type parameter argument to db (#17920)

`form_type` is a new parameter field in the terraform provider. Bring
that field into coder/coder.

Validation for `multi-select` has also been added.

coderd/database/models.go

@@ -1108,6 +1108,92 @@ func AllParameterDestinationSchemeValues() []ParameterDestinationScheme {
 	}
 }
 
+// Enum set should match the terraform provider set. This is defined as future form_types are not supported, and should be rejected. Always include the empty string for using the default form type.
+type ParameterFormType string
+
+const (
+	ParameterFormTypeValue0      ParameterFormType = ""
+	ParameterFormTypeError       ParameterFormType = "error"
+	ParameterFormTypeRadio       ParameterFormType = "radio"
+	ParameterFormTypeDropdown    ParameterFormType = "dropdown"
+	ParameterFormTypeInput       ParameterFormType = "input"
+	ParameterFormTypeTextarea    ParameterFormType = "textarea"
+	ParameterFormTypeSlider      ParameterFormType = "slider"
+	ParameterFormTypeCheckbox    ParameterFormType = "checkbox"
+	ParameterFormTypeSwitch      ParameterFormType = "switch"
+	ParameterFormTypeTagSelect   ParameterFormType = "tag-select"
+	ParameterFormTypeMultiSelect ParameterFormType = "multi-select"
+)
+
+func (e *ParameterFormType) Scan(src interface{}) error {
+	switch s := src.(type) {
+	case []byte:
+		*e = ParameterFormType(s)
+	case string:
+		*e = ParameterFormType(s)
+	default:
+		return fmt.Errorf("unsupported scan type for ParameterFormType: %T", src)
+	}
+	return nil
+}
+
+type NullParameterFormType struct {
+	ParameterFormType ParameterFormType `json:"parameter_form_type"`
+	Valid             bool              `json:"valid"` // Valid is true if ParameterFormType is not NULL
+}
+
+// Scan implements the Scanner interface.
+func (ns *NullParameterFormType) Scan(value interface{}) error {
+	if value == nil {
+		ns.ParameterFormType, ns.Valid = "", false
+		return nil
+	}
+	ns.Valid = true
+	return ns.ParameterFormType.Scan(value)
+}
+
+// Value implements the driver Valuer interface.
+func (ns NullParameterFormType) Value() (driver.Value, error) {
+	if !ns.Valid {
+		return nil, nil
+	}
+	return string(ns.ParameterFormType), nil
+}
+
+func (e ParameterFormType) Valid() bool {
+	switch e {
+	case ParameterFormTypeValue0,
+		ParameterFormTypeError,
+		ParameterFormTypeRadio,
+		ParameterFormTypeDropdown,
+		ParameterFormTypeInput,
+		ParameterFormTypeTextarea,
+		ParameterFormTypeSlider,
+		ParameterFormTypeCheckbox,
+		ParameterFormTypeSwitch,
+		ParameterFormTypeTagSelect,
+		ParameterFormTypeMultiSelect:
+		return true
+	}
+	return false
+}
+
+func AllParameterFormTypeValues() []ParameterFormType {
+	return []ParameterFormType{
+		ParameterFormTypeValue0,
+		ParameterFormTypeError,
+		ParameterFormTypeRadio,
+		ParameterFormTypeDropdown,
+		ParameterFormTypeInput,
+		ParameterFormTypeTextarea,
+		ParameterFormTypeSlider,
+		ParameterFormTypeCheckbox,
+		ParameterFormTypeSwitch,
+		ParameterFormTypeTagSelect,
+		ParameterFormTypeMultiSelect,
+	}
+}
+
 type ParameterScope string
 
 const (
@@ -3308,6 +3394,8 @@ type TemplateVersionParameter struct {
 	DisplayOrder int32 `db:"display_order" json:"display_order"`
 	// The value of an ephemeral parameter will not be preserved between consecutive workspace builds.
 	Ephemeral bool `db:"ephemeral" json:"ephemeral"`
+	// Specify what form_type should be used to render the parameter in the UI. Unsupported values are rejected.
+	FormType ParameterFormType `db:"form_type" json:"form_type"`
 }
 
 type TemplateVersionPreset struct {