Fix Jaeger tracing (#311)

Due to a recent change in the OpenTelemetry Collector, Jaeger didn't
accept OpenTelemetry data anymore. Until this change is reverted
upstream, we explicitly pass the the host IP to Jaeger as a workaround.
See jaegertracing/jaeger#5737 for more
information.

docker-compose.yml

@@ -40,6 +40,7 @@ services:
       - ${JAEGER_OLTP_PORT}:4318 #OLTP over HTTP
     environment:
       COLLECTOR_OTLP_ENABLED: "true"
+      COLLECTOR_OTLP_HTTP_HOST_PORT: 0.0.0.0:4318
 
 networks:
   postgres: