Add the possibility run shell scripts from filemanager on android (#6288)

frontend/device/generic/device.lua

@@ -5,6 +5,7 @@ This module defines stubs for common methods.
 --]]
 
 local logger = require("logger")
+local util = require("util")
 local _ = require("gettext")
 
 local function yes() return true end
@@ -394,4 +395,15 @@ function Device:ambientBrightnessLevel()
     return 0
 end
 
+--- Returns true if the file is a script we allow running
+--- Basically a helper method to check a specific list of file extensions for executable scripts
+---- @string filename
+---- @treturn boolean
+function Device:canExecuteScript(file)
+    local file_ext = string.lower(util.getFileNameSuffix(file))
+    if file_ext == "sh" or file_ext == "py"  then
+        return true
+    end
+end
+
 return Device