Update devcontainer schema for customizations.codespaces.openFiles (#161637)

extensions/configuration-editing/schemas/devContainer.schema.src.json

@@ -501,6 +501,13 @@
 											]
 										}
 									}
+								},
+								"openFiles": {
+									"type": "array",
+									"description": "The paths to the files to open when the codespace is created. Paths are relative to the workspace.",
+									"items": {
+										"type": "string"
+									}
 								}
 							}
 						}