Not a tty

Default shells seem to be limited. For example, the following step:

    - run: |
        ps
        echo "$(tty)"

produces:

   PID TTY          TIME CMD
  2587 ?        00:00:02 Runner.Listener
  2611 ?        00:00:02 Runner.Worker
  2763 ?        00:00:00 bash
  2777 ?        00:00:00 ps
not a tty

As a result, multiple tools that can provide pretty coloured logs do not work as expected. This is the case of e.g. colorama or pytest in the Python ecosystem.

A possible workaround is to use docker run --rm -t .... However, this involves installing in the container multiple resources/tools that are already available on the host. Furthermore, I don't know if windows containers are supported on windows-latest jobs.

I tried setting shell: bash -i -l {0}, but I get:

bash: cannot set terminal process group (1291): Inappropriate ioctl for device
bash: no job control in this shell

I tried python -c 'import pty; pty.spawn("/bin/sh")' too, but the job wil run for more than 10min with no output.

Which is the appropriate syntax to get a TTY?

The issue does not name a repository file or test. Start by reproducing the multiline run step and checking shell and TTY behavior on the runner, including the reported bash and container workarounds. Done would require an accepted way to request a TTY, with behavior clarified for Linux and Windows containers.