move matrix registration db to data volume

charts/matrix-registration/templates/config.yaml

@@ -11,7 +11,7 @@ data:
     base_url: {{ .Values.serverBaseUrl }}
     client_redirect: 'https://app.element.io/#/login'
     client_logo: 'static/images/element-logo.png' # use '{cwd}' for current working directory
-    db: 'sqlite:///{cwd}db.sqlite3'
+    db: 'sqlite:///data/db.sqlite3'
     host: '0.0.0.0'
     port: 5000
     rate_limit: ["100 per day", "10 per minute"]