fix: respect custom networks when computing the container ip

We also change the inspect format to support network names with non alphanumeric characters. See https://github.com/moby/moby/issues/35886 for details.

plugins/network/network.go

@@ -112,7 +112,12 @@ func GetContainerIpaddress(appName, processType, containerID string) (ipAddr str
 		}
 	}
 
-	b, err := common.DockerInspect(containerID, "{{.NetworkSettings.Networks.bridge.IPAddress}}")
+	initialNetwork := reportComputedInitialNetwork(appName)
+	if initialNetwork == "" {
+		initialNetwork = "bridge"
+	}
+
+	b, err := common.DockerInspect(containerID, fmt.Sprintf("{{ $network := index .NetworkSettings.Networks \"%s\" }}{{ $network.IPAddress}}", initialNetwork))
 	if err != nil || len(b) == 0 {
 		// docker < 1.9 compatibility
 		b, err = common.DockerInspect(containerID, "{{ .NetworkSettings.IPAddress }}")