while true do
stuff
end

theend = true
repeat
stuff
until theend == false -- will never be false so keeps repeating

--Also note there is no goto function in lua, and it is considered poor coding practices to use goto. It can cause some funky problems. Just create your code as a function and call the function instead...

function infiniteLoop()
while true do
stuff
end
end

infiniteLoop() -- to call the function