add Git SHA to uberjar for Leiningen which can be read at runtime

gistfile1.txt

; Add this to your :profile section in your project.clj:
:uberjar  {:aot        [spark.core]
                        :injections [(require '[clojure.java.shell :as shell])
                                     (spit "resources/version.txt"
                                       (clojure.string/trimr
                                         (:out
                                           (shell/sh "git" "rev-parse" "HEAD"))))]}


; You can read the file during runtime like this:
(if-let [resource (clojure.java.io/resource "version.txt")]
  (prn (slurp resource)))