Something which @Michael_Gottesman and I have previously discussed was the idea of an APT repository to get recent builds of the swift toolchain more readily.
I have setup such a repository at https://bintray.com/compnerd/swift that should be publicly accessible.
I am not sure about the long term hosting of the repository, as bintray has a pretty small limit and the toolchain package is ~250MiB. The packages should be uploaded hourly (after building on Azure). This means that I will probably have to figure out some solution to purging of older releases frequently. However, this should allow for an easy way to grab a toolchain at a point in time at least.
The repository contains packages for ICU, the toolchain, the Linux, Windows and Android (Swift) SDKs. The prepackaged version of these packages into a docker image are still available at http://hub.docker.com/r/compnerd/swift