So I want to run alertmanager as docker in my own docker network like:
```
NAME := alertmanager
IP := 172.32.0.44
docker run -d \
--net production \
--ip \"$(IP)\" \
-v /srv/alertmanager/:/alertmanager \
-v /srv/alertmanager-etc/config.yml:/etc/alertmanager/config.yml \
--restart=always \
--name \"$(NAME)\" \
--dns 172.32.0.2 prom/\"$(NAME)\"
```
But I get this error:
```
level=info ts=2018-07-27T18:20:03.387801651Z caller=main.go:174 msg="Starting Alertmanager" version="(version=0.15.1, branch=HEAD, revision=8397de1830f154535a31150f9262da0072d8725d)"
level=info ts=2018-07-27T18:20:03.387905366Z caller=main.go:175 build_context="(go=go1.10.3, user=root@efde7f9485ae, date=20180712-18:25:27)"
level=warn ts=2018-07-27T18:20:03.393156442Z caller=cluster.go:148 component=cluster err="couldn't deduce an advertise address: no private IP found, explicit advertise addr not provided"
level=error ts=2018-07-27T18:20:03.399208639Z caller=main.go:199 msg="unable to initialize gossip mesh" err="create memberlist: Failed to get final advertise address: No private IP address found, and explicit IP not provided"
```
Is there an option to pass the IP as ENV variable?