Hide the new Phriction "Publish" operation behind the "Prototype" toggle

Summary: Ref T13077. This is currently a little too confusing to go out into the world, mostly because there's no way to edit documents without auto-publishing them. Keep it out of the spotlight for this release.

Test Plan: Viewed Phriction, saw publish operation marked as a prototype.

Reviewers: amckinley

Maniphest Tasks: T13077

Differential Revision: https://secure.phabricator.com/D19627

src/applications/phriction/controller/PhrictionDocumentController.php

@@ -432,13 +432,17 @@ final class PhrictionDocumentController
 
     $publish_uri = "/phriction/publish/{$id}/{$content_id}/";
 
-    $curtain->addAction(
-      id(new PhabricatorActionView())
-      ->setName($publish_name)
-      ->setIcon('fa-upload')
-      ->setDisabled(!$can_publish)
-      ->setWorkflow(true)
-      ->setHref($publish_uri));
+    if (PhabricatorEnv::getEnvConfig('phabricator.show-prototypes')) {
+      $publish_name = pht('Publish (Prototype!)');
+
+      $curtain->addAction(
+        id(new PhabricatorActionView())
+        ->setName($publish_name)
+        ->setIcon('fa-upload')
+        ->setDisabled(!$can_publish)
+        ->setWorkflow(true)
+        ->setHref($publish_uri));
+    }
 
     if ($document->getStatus() == PhrictionDocumentStatus::STATUS_EXISTS) {
       $curtain->addAction(