Build: Support jquery-release --dry-run flag
Build: Support jquery-release --dry-run flag

Without this change passing `--dry-run` to jquery-release still pushes to the
jquery-dist repository which is dangerous as one can assume `--dry-run` to be
safe from external side effects.

Close gh-4498
jquery/jquery,jquery/jquery,roytoo/jquery,jquery/jquery,roytoo/jquery,roytoo/jquery