Add validate handler to install selected packages from Welcome wizard

sys/apps/Welcome.lua

@@ -129,6 +129,19 @@ local page = UI.Page {
 				text = 'More Packages...',
 				event = 'packages',
 			},
+			validate = function(self)
+				local toInstall = { }
+				if self.chkTurtle.value then
+					table.insert(toInstall, 'remoteturtle')
+				end
+				if self.chkInventory.value then
+					table.insert(toInstall, 'inventory-manager')
+				end
+				for _, pkg in ipairs(toInstall) do
+					shell.run('package install ' .. pkg)
+				end
+				return true
+			end,
 		},
 		contributors = UI.WizardPage {
 			index = 5,