Add support for Windows

[fritzmg]

This PR adds support for Windows by using tasklist /FI "PID eq …". Since this executable will always exit with code 0 we instead have to inspect its output. Symfony Process will start any processes under Windows as a cmd.exe subprocess. As such tasklist /FI "PID eq …" will then have an output like this for the given process ID (with an English locale):

Image Name                     PID Session Name        Session#    Mem Usage
========================= ======== ================ =========== ============
cmd.exe                      15048 Console                    5      5

In case the PID is not found, the output will look like this:

INFO: No tasks are running which match the specified criteria.

Thus this PR assumes that as long as cmd.exe is in the output, the process with the given process ID is still actually running.

[Toflar]

I guess we should integrate this also into our tests and run those on windows only (and the current ones on linux only). I've just pushed the foundation for Github tests to develop. Can you rebase and maybe integrate the logic in the tests?

[fritzmg]

Hm, right now I can't come up with a way to adjust countSleepProcesses() for Windows though 🤔

[fritzmg]

I mean the test would work, if you run it in a cygwin or mingw command line under Windows - is that something you can set up? Then this could be merged as is.

[Toflar]

My goal would be to add another job in the workflows with runs-on: windows-latest. Does tasklist not contain all the sleep commands?

[fritzmg]

No, Symfony Process starts every process via cmd.exe - so tasklist will only see cmd.exe and nothing else (and you cannot inspect command arguments with tasklist).

[Toflar]

Maybe in conjunction with https://github.com/marketplace/actions/install-cygwin then? I'm not familiar with it at all so I don't think I can set this up^^

[fritzmg]

Besides, the runner.php will also only work on Unix and cygwin/mingw environments, as there is no sleep command under Windows.

[fritzmg]

Maybe in conjunction with https://github.com/marketplace/actions/install-cygwin then? I'm not familiar with it at all so I don't think I can set this up^^

Me neither, but we can try ;)