Add The Setup's env when Xcode copy files to bundle.

atom.gyp

@@ -144,9 +144,7 @@
             {
               'postbuild_name': 'Copy and Compile Static Files',
               'action': [
-                'rake',
-                '--trace',
-                'copy-files-to-bundle',
+                'script/copy-files-to-bundle'
               ],
             },
             {
@@ -326,9 +324,7 @@
             {
               'postbuild_name': 'Copy and Compile Static Files',
               'action': [
-                'rake',
-                '--trace',
-                'copy-files-to-bundle',
+                'script/copy-files-to-bundle'
               ],
             },
           ],

script/copy-files-to-bundle

@@ -0,0 +1,12 @@
+#!/bin/sh
+# This can only be run by xcodebuild!
+
+# Because of the way xcodebuild invokes external scripts we need to load
+# The Setup's environment ourselves. If this isn't done, things like the
+# node shim won't be able to find the stuff they need.
+
+if [ -f /opt/github/env.sh ]; then
+  source /opt/github/env.sh
+fi
+
+rake --trace copy-files-to-bundle