fix(prometheus): set network_mode explicit to bridge for prometheus c…

…ontainer (workaround)

roles/prometheus/tasks/prometheus.yml

@@ -58,6 +58,8 @@
       - "{{ prometheus_port }}:9090"
     networks:
       - name: "{{ docker_network_name }}"
+    #FIXME: explicit setting of network_mode: bridge is just a workaround and shouldn't be necessary
+    network_mode: bridge
     etc_hosts: "{{ prometheus_etc_hosts }}"
     log_driver: "{{ docker_log_driver }}"
     log_options: