add ink endpoint environment variable

config/universal.js

@@ -3,6 +3,7 @@ const path = require('path')
 
 const editoriaMode = require('../app/authsome_editoria')
 
+const inkEndpoint = process.env.INK_ENDPOINT
 const inkUsername = process.env.INK_USERNAME
 const inkPassword = process.env.INK_PASSWORD
 
@@ -25,7 +26,7 @@ module.exports = {
     }
   },
   inkBackend: {
-    inkEndpoint: 'http://ink-api.coko.foundation',
+    inkEndpoint: inkEndpoint || 'http://ink-api.coko.foundation',
     email: inkUsername,
     password: inkPassword
   },