feat: Allow multiple origins for header Access-Control-Allow-Origin (#8517)

src/Options/Definitions.js

@@ -81,7 +81,9 @@ module.exports.ParseServerOptions = {
   },
   allowOrigin: {
     env: 'PARSE_SERVER_ALLOW_ORIGIN',
-    help: 'Sets the origin to Access-Control-Allow-Origin',
+    help:
+      'Sets origins for Access-Control-Allow-Origin. This can be a string for a single origin or an array of strings for multiple origins.',
+    action: parsers.arrayParser,
   },
   analyticsAdapter: {
     env: 'PARSE_SERVER_ANALYTICS_ADAPTER',