fix --gpus option for docker
# What does this PR do?

Some multi-GPUs tests in scheduled CI workflow file use `--gpus 0`. I think it is an error, and we might test with only 1 GPU for those multi GPUs tests.

This PR fixes it. 

**Remark**: It's quite strange that, from the setup job log, we can see 2 GPUs in `nvidia-smi` while we have `options: --gpus 0`. I am not 100% sure if this PR has real value, but at least it avoids some confusing maybe.
_The documentation is not available anymore as the PR was closed or merged._