Refreshing build page enqueues new build

[Josh Triplett <josh@joshtriplett.org>]

I recently tried the web-based live-build tool at
http://live-build.debian.net/cgi-bin/live-build , and I noticed an
unfortunate bug.  After submitting a request for a build, refreshing
the resulting page will submit another build, rather than updating the
status of the already submitted build as expected.  Perhaps the
live-build script should use a POST, and do a redirect after the POST to
a page that just remembers the build ID and shows the status of the
build?

- Josh Triplett