Use mkdir instead of tar to lock the erlang install directory (#242)

Use mkdir instead of tar to lock the erlang install directory when using bazel built erlang

Author: HoloRin

tools/erlang_toolchain.bzl

@@ -58,10 +58,11 @@ def maybe_install_erlang(ctx, short_path = False):
         return ""
     else:
         return """\
-if [[ ! -d "{erlang_home}" ]]; then
+mkdir -p $(dirname "{erlang_home}")
+if mkdir "{erlang_home}"; then
     tar --extract \\
         --directory / \\
-        --file {release_tar} || test -d "{erlang_home}"
+        --file {release_tar}
 fi""".format(
             release_tar = release_dir_tar.short_path if short_path else release_dir_tar.path,
             erlang_home = info.erlang_home,