If you don’t need email support, you can use https://dashboard.literatecomputing.com/ for free if you join the Free Trial group. You enter your hostname, paste in API keys for Digital Ocean and Mailgun and it’ll create the droplet, configure mailgun, send you an email with the required DNS records and finish the install once the DNS stuff is in place.
This will get you a supported install in the sense that it follows INSTALL-cloud. It does not give you an install that is supported for free.
If you need help filling in those fields or setting up DNS records, you might need to pay for support.