[docker-compose] Reduce privileges

[rcmorano]

I spotted security_opt: [seccomp:unconfined] and ipc: host in docker-compose.yaml to be unnecessary, so I commented them out and have been running like this since some versions now without any apparent issues.

My doubts about them being required for some kind of host fine-tuning are almost dispelled by now, but I might be wrong. If I'm not, it would be cool to just remove these.

[wenis]

Appreciate it. I'll test on my end and tighten up if not necessary.