Running Chapel and PyTorch numerical correspondence tests through Github Actions

[Iainmon]

          Github actions at `.github/actions/hello-action` paired with locally tested `Dockerfile` image at `docker/chapel-pytorch-test/.` at commit [054f330](https://github.com/Iainmon/ChAI/pull/29/commits/054f330d0bbe50703180fbe974cb1c7d83b2702d) is ready to be developed, such that the Github Action that calls it will verify Chapel and PyTorch numerical correspondence via Python testing through the Chapel Docker image.

Originally posted by @Iainmon in #29 (comment)