* fix typo in entrypoint script invocation from the server dockerfile
* use sh in the entrypoint shebang instead of bash
* make entrypoint script executable
* MS SQL server integration
* enable mssql service to test, create and process connection
* return 400 when query fails
* [Docker] Install freetds on buster
Co-authored-by: navaneeth <navaneethpk@outlook.com>