Resolve "Can't install the chart twice into the same namespace"

Closes #1031 (closed)

Also makes sure that the helm deployment gets removed after merging the MR.

templates/nextcloud-mariadb-initdbscripts.yaml

-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: "nextcloud-mariadb-initdbscripts"
-data:
-  setup.sql: |
-    CREATE USER {{ .Values.onlyoffice.database.user }} IDENTIFIED BY '{{ .Values.onlyoffice.database.password }}';
-    CREATE DATABASE {{ .Values.onlyoffice.database.name }};
-    GRANT ALL PRIVILEGES ON {{ .Values.onlyoffice.database.name }}.* TO '{{ .Values.onlyoffice.database.user }}'@'%';