Publish port 8089 UDP to enable ProxMox to write to the db

[olivierfaber]

Problem/Motivation

Proxmox only works with InfluxDB on UDP (8089). Right now, only TCP is published from the container.
HTTP could also be an option, but it has a certificate that's only valid when accessed on DNS and I don't feel comfortable opening these ports to the outside world.

Expected behavior

Have Proxmox write it's metrix to the influxdb addon through UDP port 8089

Proposed changes

Add a configuration option to open UDP 8089 (closed by default).

[frenck]

Duplicate of many others.