add faq

Author: denis-yuen

docs/advanced-topics/dockstore-cli/dockstore-cli-faq.rst

@@ -116,6 +116,17 @@ To prevent these issues from happening, we recommend setting up your Cromwell co
 
 :ref:`(back to top) <topCLIFAQ>`
 
+How do I store my CLI token in a password vault or encrypted file
+-----------------------------------------------------------------
+
+If for regulatory reasons, you want to kick your security up a notch and store your dockstore token in a password vault or similar,
+we have the option of retrieving your Dockstore token using a user-defined command. For example the following will retrieve the token from a different text file:
+
+::
+
+    token = cat /home/my-user/dockstoreTokenVault.txt
+    server-url = https://www.dockstore.org/api
+
 The CLI is failing with Java 8 or 11
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