chore: add VS Code dev container

[mihaitodor]

Summary of Changes

This adds the required config for VS Code Dev Container support. With this change, opening the repo in VS Code will prompt you to reload the editor and, assuming you have Docker up and running, it will pull the required Docker image and start it. Expect it to download a 1.4GB image. Once the container is running, it will install a bunch of dependencies, including tox. It will show you the log as it progresses, but, at the end of the process, VS Code will run in this container in headless mode and you can open a separate terminal in which you can run the tox command which should complete successfully.

I haven't spotted any specific section related to the code editor in the Readme / Contributing docs, so not sure if you'd like to have a paragraph about this feature, or at least mention somewhere that people will want to use VS Code if they wish to leverage this Dev Container setup for their work / tests.

Related Issues

Fixes #1979.

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[codecov[bot]]

Codecov Report

Merging #2132 (c9933a3) into master (e00f5cd) will not change coverage. The diff coverage is n/a.

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  Coverage   100.00%   100.00%           
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  Files           55        55           
  Lines         5553      5553           
  Branches       880       880           
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  Hits          5553      5553           

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[CaselIT]

I've tried using podman on wsl fedora and everything seems to work but I've had to uncomment "remoteUser": "root" or is was failing to copy some stuff when initializing the container.

This is probably a potman thing only since I think it will not run containers as root contrary to docker.

I think we could keep as is. @vytas7 thoughts?

[mihaitodor]

@CaselIT Thanks for testing! I added some documentation as requested. If you think it's too detailed / wordy, I'm happy to adjust it.

[vytas7]

(It seems that flake8-import-order has now been updated with support for the newest flake8, rerunning the CI.)

[mihaitodor]

Yeah, they'll be asked when they open the project in VS Code if they want to reopen it in a Dev Container, but they can just click no.

[vytas7]

Aha, OK, I didn't know that VSCode would ask that question automatically. But let's give it a try, we can always disable this if we get more negative than positive feedback.

[CaselIT]

It's just a notification, you can just ignore it too, so it should be fine

[vytas7]

I see; I've just tested it myself for the heck of it, and it should be fine :100: Let's see if anyone complains :smiling_imp: