prepare Vagrant instead of devcontainer for platforms other than linux.

[utam0k]

Use vagrant because container in container is difficult for security reasons.

[YJDoc2]

Hey, I think it would be good idea to include information that something like virtualbox needs to be also installed for vagrant to work, I was trying to test this on linux, and at least on it, vagrant needs virtualbox already installed.

That said, this is meant for non-linux OSs so someone running such OSs might give a better opinion.

[utam0k]

@YJDoc2 I wasn't sure if I should include it in the README, but I didn't think it was necessary to support it in the README. Do you think about?

[Furisto]

On Windows Hyper-V is the most likely virtualization solution to be available

[tsturzl]

I had worked on something similar, mostly with the intention of addressing #39. I found that it was difficult to get the integration tests working in these VMs. Often times the swap accounting features were disabled in the kernel which causes the runtime-tools to outright fail even when testing runc. I hadn't figured out a way to address this yet without doing a lot of setup steps to modify kernel boot params, which quickly became cumbersome. I had fooled around on this branch: https://github.com/tsturzl/youki/tree/ts-multi-system-testing

I ultimately put this work aside awaiting a response on opencontainers/runtime-tools#721

[utam0k]

@tsturzl @Furisto @YJDoc2 PTAL

[utam0k]

I had worked on something similar, mostly with the intention of addressing #39. I found that it was difficult to get the integration tests working in these VMs. Often times the swap accounting features were disabled in the kernel which causes the runtime-tools to outright fail even when testing runc. I hadn't figured out a way to address this yet without doing a lot of setup steps to modify kernel boot params, which quickly became cumbersome. I had fooled around on this branch: https://github.com/tsturzl/youki/tree/ts-multi-system-testing

I ultimately put this work aside awaiting a response on opencontainers/runtime-tools#721

I have seen your branch. It is great. It would be better if runtime-tools could solve this problem, but they don't seem to be very active. I guess we'll just have to deal with it on youki side.