fix: use upstream zulip image in v0.8
Damn, upgrade pipeline now fails with
Failed to pull image "open.greenhost.net:4567/stackspin/stackspin/zulip:5.0-rc1": rpc error: code = NotFound desc = failed to pull and unpack image "open.greenhost.net:4567/stackspin/stackspin/zulip:5.0-rc1": failed to resolve reference "open.greenhost.net:4567/stackspin/stackspin/zulip:5.0-rc1": open.greenhost.net:4567/stackspin/stackspin/zulip:5.0-rc1: not found
We already deleted our 5.0-rc1 custom image so we need to use the upstream one. 5.0-rc1-0 didn't work so I "upgraded" to 5.0-0.
Edited by Varac