A github workflow to run tests on gpu

[SarahAlidoost]

Currently, there is a python script gpu_sample_run.py for testing the model using gpu. However, it is not added to tests folder and there is no github action workflow that can run such a test. For GPU, we need to set-up self-hosted runner. There is an examples using google colab, see here. But this needs to be discussed more.

Alternatively, there is a github action cuda-toolkit that can be used to test build without running any tests.