add grafana_plugins_ops to defaults and docs (#251)

Co-authored-by: Ishan Jain <51803183+ishanjainn@users.noreply.github.com>

roles/grafana/README.md

@@ -64,6 +64,7 @@ All variables which can be overridden are stored in [defaults/main.yml](defaults
 | `grafana_datasources` | [] | List of datasources which should be configured |
 | `grafana_environment` | {} | Optional Environment param for Grafana installation, useful ie for setting http_proxy |
 | `grafana_plugins` | [] |  List of Grafana plugins which should be installed |
+| `grafana_plugins_ops` | {} |  [plugins](https://grafana.com/docs/grafana/latest/setup-grafana/configure-grafana/#plugins-1) configuration section |
 | `grafana_alert_notifications` | [] | List of alert notification channels to be created, updated, or deleted |
 
 Data source example:

roles/grafana/defaults/main.yml

@@ -239,10 +239,15 @@ grafana_feature_toggles: {}
 #  regressionTransformation: true
 
 #######
-# Plugins from https://grafana.com/plugins
+# Plugins to install from https://grafana.com/plugins
 grafana_plugins: []
 #  - raintank-worldping-app
 
+#######
+# Configuration of plugins  ([plugin] section of grafana.ini]
+grafana_plugins_ops: {}
+#  allow_loading_unsigned_plugins: alexanderzobnin-zabbix-datasource
+
 # Dashboards from https://grafana.com/dashboards
 grafana_dashboards: []
 #  - dashboard_id: '4271'

roles/grafana/templates/grafana.ini.j2

@@ -38,7 +38,7 @@ root_url = {{ grafana_url }}
 {% endfor %}
 
 # Plugins
-{% if grafana_plugins_ops is defined %}
+{% if grafana_plugins_ops != {} %}
 [plugins]
 {% for k,v in grafana_plugins_ops.items() %}
 {{ k }} = {{ v }}