* Initial matrixSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* License header

* MySQL DB testSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Create matrix for DBsSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* RabbitMQ and H2Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* MySQL 8.0Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Postgresql test supportSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Postgresql test supportSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Fix DB issues post and mssql

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Wait MSSQL

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Fix postgresql tests.

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* MSSQL startup fix.Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Fix syntax error

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Further fix postgres tests.Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Revert unnecessary changes.

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Add SonarCloud Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Simplify devcontainer. Test JDK 15Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>