docker: allow specifying external networks

Signed-off-by: Jakub Sokołowski <jakub@status.im>

defaults/main.yml

@@ -9,6 +9,7 @@ grafana_cont_name: '{{ grafana_service_name }}'
 grafana_cont_vol: '{{ grafana_service_path }}/data'
 # see: http://docs.grafana.org/installation/docker/#migration-from-a-previous-version-of-the-docker-container-to-5-1-or-later
 grafana_cont_uid: 472
+grafana_cont_networks: []
 # Permission adjust for dockremap.
 grafana_host_uid: '{{ 100000 + grafana_cont_uid | int }}'
 grafana_cont_port: 9400

templates/docker-compose.yml.j2

@@ -6,6 +6,9 @@ services:
     restart: always
     environment:
       GF_INSTALL_PLUGINS: '{{ grafana_plugins | join(",") }}'
+{% if grafana_cont_networks != [] %}
+    networks: {{ grafana_cont_networks | to_json }}
+{% endif %}
     ports:
       - '127.0.0.1:{{ grafana_cont_port }}:{{ grafana_cont_port }}'
     volumes:
@@ -16,3 +19,11 @@ services:
       interval: 30s
       timeout: 10s
       retries: 3
+
+{% if grafana_cont_networks != [] %}
+{% for network in grafana_cont_networks %}
+networks:
+  {{ network }}:
+    external: true
+{% endfor %}
+{% endif %}