Then, clean your git repository and build the archive. It will give
you an archive file in the build dir:
-'SimGrid-Java-${inside_release_version}.tar.gz' or
'SimGrid-Ruby-${inside_release_version}.tar.gz'.
\verbatim
-$ cd simgrid-java (or simgrid-ruby)
+$ cd simgrid-ruby
$ git reset --hard master
$ git clean -dfx
$ mkdir build
