Amit Khandelwal reminds us that MSDTC exists:
It’s been a while since I’ve had the opportunity to write and share a blog post about SQL Server containers and Linux. Today, I’d like to show you how to set up and use MSDTC (Microsoft Distributed Transaction Coordinator) to execute distributed transactions for SQL Server containers running on a Kubernetes platform.
Please see the following documentation for more information on DTC and SQL Server on Linux. How to configure MSDTC on Linux – SQL Server | Microsoft Docs.
I kid (sort of) but it is good to see as much parity between the Windows and Linux versions of SQL Server as possible.