Resolve "Switch from postgres to mariadb"

Closes #1011 (closed)

templates/nextcloud-mariadb-initdbscripts.yaml

+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: "{{ .Release.Name }}-mariadb-initdbscripts"
+  namespace: stackspin-apps
+data:
+  setup.sql: |
+    CREATE USER onlyoffice IDENTIFIED BY '{{ .Values.onlyoffice.database.password }}';
+    CREATE DATABASE onlyoffice;
+    GRANT ALL PRIVILEGES ON onlyoffice.* TO onlyoffice;