Support for Multiple Build Contexts in Dockerfile with TestContainers

[nesherhh]

I have a Dockerfile that uses multiple build contexts with the COPY --from=<buildcontext> syntax. When building the image manually, I use the docker build command with the --build-context flag, like this:

docker build --build-context abc=/path/to/context1 --build-context xyz=/path/to/context2 -f Dockerfile .

However, I'm now trying to use TestContainers for .NET to automate my testing, and I can't find a way to specify multiple build contexts when building an image with ImageFromDockerfile.

My Questions:

1. Is there a way to specify --build-context for multiple build contexts directly in TestContainers for .NET?
2. If not, are there any plans to support this feature in the future?
3. What are the recommended workarounds for using multiple build contexts with TestContainers?

I’d prefer to keep my Dockerfile unchanged, as modifying it to merge contexts isn't an ideal solution for my use case.

Thanks for any guidance!