Add missing documentation file. refs #6520

diff --git a/doc/install/install-compute-ping.html.textile.liquid b/doc/install/install-compute-ping.html.textile.liquid
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+---
+layout: default
+navsection: installguide
+title: Sample compute node ping script
+...
+
+When a new elastic compute node is booted, it needs to contact Arvados to register itself.  Here is an example ping script to run on boot.
+
+<notextile> {% code 'compute_ping_rb' as ruby %} </notextile>