MS SQL Server default database not correctly set with Docker Compose

[jdubois]

This was found while working on #7245

The current Docker Compose configuration expects that the MS SQL Server database is called "jhipstertest", which of course doesn't work by default.

Unfortunately, it is not possible to create a MS SQL Server database schema at startup, see microsoft/mssql-docker#2

We could do it by using a complex Docker configuration like we have for MongoDB or Couchbase, but to have a much simpler setup my idea is to use the default "tempdb" that is created by the MS SQL Server Docker image.

• this will make Docker Compose work
• if the application is used outside Docker, it will continue to use the "normal" database name, which is the name of the app (as usual with JHipster)
• the only case that's a bit strange is if you run your app locally, but want to connect to a MS SQL Server instance inside Docker, as in this case you will need to configure the "tempdb" database in the connection String in the application-*.yml configuration file(s)

Of course using "tempdb" isn't good for production use, but I don't think you are allowed to use those images in production (by the Microsoft terms of service), and anyway it's not a recommended use of Docker.