I do not know Stipple.
But I recently successfully deployed a Dash.jl app on Azure (making use of Docker). I don’t have time to put together a how-to, but if anyone wants to go the Azure path, I can try and answer specific questions. Here is a tutorial for Dash/Python on Azure (I think I followed this one). I think Azure does have some free quotas for webapps.
I will also cross reference this thread