Parse the items property on config type declarations

When parsing a template, parse the `items` property on configuration type declarations.

Fixes #606

CHANGELOG_PENDING.md

@@ -3,3 +3,6 @@
 - [features] add "pulumi.organiztion" to the built-in "pulumi" variable to obtain the current organization.
 
 ### Bug Fixes
+
+- Parse the items property on config type declarations to prevent diagnostic messages about
+  unknown fields [#615](https://github.com/pulumi/pulumi-yaml/pull/615)

pkg/pulumiyaml/ast/template.go

@@ -268,6 +268,16 @@ func (d *PropertyMapDecl) parse(name string, node syntax.Node) syntax.Diagnostic
 	return diags
 }
 
+type ConfigItemsDecl struct {
+	declNode
+
+	Type *StringExpr
+}
+
+func (d *ConfigItemsDecl) recordSyntax() *syntax.Node {
+	return &d.syntax
+}
+
 type ConfigParamDecl struct {
 	declNode
 
@@ -276,6 +286,7 @@ type ConfigParamDecl struct {
 	Secret  *BooleanExpr
 	Default Expr
 	Value   Expr
+	Items   *ConfigItemsDecl
 }
 
 func (d *ConfigParamDecl) recordSyntax() *syntax.Node {

pkg/pulumiyaml/ast/template_test.go

@@ -16,6 +16,13 @@ import (
 const example = `
 name: simple-yaml
 runtime: yaml
+config:
+  some-string-array:
+    type: array
+    items:
+      type: string
+  some-boolean:
+    type: boolean
 resources:
   my-bucket:
     type: aws:s3/bucket:Bucket