dev: fix run-server-image script
Created by: rvantonder
17:20:05 postgres_exporter | postgres_exporter: error: not a valid logrus Level: "dbug", try --help
when I run IMAGE=sourcegraph/server:3.11.0-rc.2 ./dev/run-server-image.sh
I changed it to debug
and it works. Don't know if this is the right move. No recent change to this line so I don't know why this didn't fail before.