add traefik cors setting from vhr

traefik-dynamic.yml

@@ -25,3 +25,12 @@ http:
     redirect:
       redirectScheme:
         scheme: https
+    cors:
+      headers:
+        accessControlAllowMethods:
+          - GET
+          - OPTIONS
+          - POST
+        accessControlAllowOrigin: "origin-list-or-null"
+        accessControlMaxAge: 7200
+        addVaryHeader: false