[luci] Template button execute lua code

[Jo-Philipp Wich]

Usually you'd do it like this:

<%
  if luci.http.formvalue("run_script") then
    os.execute("/path/to/script.sh >/dev/null")
  end
%>

...

<input type="submit" name="run_script" value="Run Script" />


Note that the value of the name="..." attribute and the formvalue check
must match.

~ Jow