Store tmp repos as a set
Store tmp repos as a set

Otherwise, we're adding the same repo to the vector for every upload,

technomancy/clojars-web,nberger/clojars-web,tobias/clojars-web,nberger/clojars-web,tobias/clojars-web,clojars/clojars-web,ato/clojars-web,technomancy/clojars-web,ato/clojars-web,clojars/clojars-web,tobias/clojars-web,clojars/clojars-web