docs: add postgresql datasource example (#1076)

Co-authored-by: Hubert Stefanski <35736504+HubertStefanski@users.noreply.github.com>

examples/datasource_types/README.md

@@ -0,0 +1,9 @@
+---
+title: "Datasource types"
+linkTitle: "Datasource types"
+---
+
+This example shows different types of datasources and how to configure them.
+
+{{< readfile file="prometheus.yaml" code="true" lang="yaml" >}}
+{{< readfile file="postgresql.yaml" code="true" lang="yaml" >}}

examples/datasource_types/postgresql.yaml

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+apiVersion: grafana.integreatly.org/v1beta1
+kind: GrafanaDatasource
+metadata:
+  name: postgresql
+  namespace: grafana
+spec:
+  instanceSelector:
+    matchLabels:
+      dashboards: "grafana"
+  datasource:
+    name: postgresql
+    type: postgres
+    database: postgres
+    editable: false
+    jsonData:
+      connMaxLifetime: 14400
+      maxIdleConns: 2
+      maxOpenConns: 0
+      postgresVersion: 1400
+      sslmode: disable
+      timescaledb: false
+    access: proxy
+    secureJsonData:
+      password: postgres
+    url: postgresql.namespace.svc:5432
+    user: postgres

examples/datasource_types/prometheus.yaml

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+apiVersion: grafana.integreatly.org/v1beta1
+kind: GrafanaDatasource
+metadata:
+  name: prometheus
+spec:
+  instanceSelector:
+    matchLabels:
+      dashboards: "grafana"
+  datasource:
+    name: prom1
+    type: prometheus
+    access: proxy
+    url: http://prometheus-service:9090
+    isDefault: true
+    jsonData:
+      'tlsSkipVerify': true
+      'timeInterval': "5s"
+    editable: true