release: Don't remove OUTPUT_DIR on exit.
release: Don't remove OUTPUT_DIR on exit.

This ends up deleting your local copy of the release tarball, which
can be annoying if you need to upload it manually to the GitHub
releases page.

andersk/zulip,rht/zulip,zulip/zulip,rht/zulip,rht/zulip,andersk/zulip,zulip/zulip,andersk/zulip,zulip/zulip,rht/zulip,zulip/zulip,rht/zulip,zulip/zulip,andersk/zulip,andersk/zulip,rht/zulip,zulip/zulip,rht/zulip,zulip/zulip,andersk/zulip,andersk/zulip