Bug: MSSQL (SqlServerContainer) ignores some parameters

Describe the bug

When running the SqlServerContainer, in this example with the image mcr.microsoft.com/mssql/server:2022-CU12-ubuntu-22.04, some parameters have no effect on the actual database and lead to failures. It seems like they are just not respected.

To Reproduce

import sqlalchemy
from testcontainers.mssql import SqlServerContainer

def test_showcase_bug():
    with SqlServerContainer(image="mcr.microsoft.com/mssql/server:2022-CU12-ubuntu-22.04", username="dummy") as mssql:
        engine = sqlalchemy.create_engine(mssql.get_connection_url()) # this includes the username "dummy" now.
        print(mssql.get_connection_url())
        with engine.begin() as connection:
            result = connection.execute(sqlalchemy.text("select @@VERSION"))

It loads a while. When looking at the database logs, it prints:

2024-11-14 10:39:43.81 Logon       Error: 18456, Severity: 14, State: 5.
2024-11-14 10:39:43.81 Logon       Login failed for user 'dummy'. Reason: Could not find a login matching the name provided. [CLIENT: 172.17.0.3]

Same thing for other parameters, for example db_name.

Runtime environment

Provide a summary of your runtime environment. Which operating system, python version, and docker version are you using? What is the version of testcontainers-python you are using? You can run the following commands to get the relevant information.

Windows 11
Python 3.11.9
testcontainers 4.8.2
sqlalchemy 2.0.36
pymssql 2.3.1

Thanks for your work!

Start at the SqlServerContainer implementation and reproduce the example with the specified MSSQL image, username, and db_name parameters. Trace how these parameters are passed to the container and connection URL, then verify that the running database applies them and that the example no longer fails authentication.