How to Install nRF DeviceTree VS Code Extension with code-server?

I'm working on a Docker image that includes a VS Code server for the purposes of workshops and training, and I'd like to install the nRF extensions (e.g. https://marketplace.visualstudio.com/items?itemName=nordic-semiconductor.nrf-devicetree) in the Code Server. However, I get the following error when installing in a Debian container:

# code-server --install-extension nordic-semiconductor.nrf-devicetree
Installing extensions...
Extension 'nordic-semiconductor.nrf-devicetree' not found.
Make sure you use the full extension ID, including the publisher, e.g.: ms-dotnettools.csharp
Failed Installing Extensions: nordic-semiconductor.nrf-devicetree

Other extensions (e.g. CMake Tools) install fine with this method. My workaround would be to download the .vsix file and manually install it, but it doesn't seem that Nordic offers a way to directly download this file.

Any tips or clues on how I can install this extension with code-server?

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