sg: ctags binary not found

Created by: camdencheek

When starting sg on the latest main (7bfcf61), zoekt-indexserver is failing with a ctags binary not found error.

[zoekt-indexserver-1] OUT: 2021/04/09 09:22:28 indexGitRepo(/Users/ccheek/.sourcegraph/zoekt/index-1/.indexserver.tmp/tmpfriend-85083-518348262/gitlab.sgdev.org%2Fbob_uwe%2Fbob_uwe_public.git): ctags binary not found, but CTagsMustSucceed set

Installing ctags with brew didn't seem to help