[racket] Is there a URL representing the latest nightly build installer for a platform?

I'm using Travis CI for a number of my projects, to test them against
recent Racket releases.

Sam had a great suggestion: Add 5.90.x to the build matrix. [1]

I could update my .travis.yml to use e.g.
http://www.cs.utah.edu/plt/snapshots/current/installers/racket-5.90.0.9-x86_64-linux-precise.sh

That would work great...for awhile. But what happens if the version
rolls to 5.90.0.10?  I'd be fetching the old, wrong thing until
someone noticed.

Instead: Is there some "abstract" URL meaning (a) the latest version
(b) of a platform like x86_64-linux-precise?

For example instead of

  ... current/installers/racket-5.90.0.9-x86_64-linux-precise.sh

it would be (say)

  ... current/installers/latest/x86_64-linux-precise.sh


Note that I don't care what the actual filename ends up being. So this
abstract URL could be a 302 Found redirect where the Location response
header is whatever the specific version happens to be, just like the
status quo.

(I suppose anyone, even I, could set up such a redirect server. The
problem would be coordinating it with the HEAD version bumps, and
manually updating the redirect at the same time the version bumps. So
same problem, just whacka-moled elsewhere.)


[1]: https://github.com/greghendershott/frog/issues/56