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PR summary
This pull request adds a GitHub codespaces configuration for Matplotlib. With this PR, contributors can open a pre-configured development environment and get started with contributing to Matplotlib right away from their browser. I'm not sure if you can test it as it is, as I believe this needs to be merged to main before anyone is able to open a codespace from the Matplotlib repo.
Once this is merged, it will enable users to go to matplotlib/matplotlib or their own fork and choose "Create codespaces on

<branch>
":This will open a browser window with a VSCode interface and a pre installed development environment built over an Ubuntu image. Users can then do
After that you can run tests, build the documentation and run other commands.
This configuration also includes a lightweight fluxbox environment
To be done in a follow-up: documentation on how to use it and current features (like connecting to the fluxbox desktop to see plots).
PR checklist