Some of our artifacts are quite large (100M) and get built a lot (we're past
build #800) if we were to keep all of them, there would be problems.

So we use "delete all but last successful artifact" to purge the old ones.

But we'd like to be able to keep the versions that we release to others without
stopping our build.

At present we do this by having a separate project that we trigger manually and
have it keep every build artifact... This causes problems with the builds
storing subcomponents in the maven repository (have seen artifacts get cross
populated Need that lock functionality from issue #220 between the two builds
if they decide to run in parallel)