Helm chart does not support SQLite

[mikesouza]

The Helm chart does not support using a SQLite datastore:

1. The schema validation doesn't allow sqlite
2. There are probably other changes to the chart that must be made to support sqlite...

Just an idea... Since the chart already supports specifying extra volumes and volume mounts, it would be great if you could specify the path on the FGA server container of the sqlite database to use- if it doesn't exist, it could create a new database, otherwise it would use the existing mounted database.