Enable RDMA tests in OSS CI (meta-pytorch#1255)

Summary:
Pull Request resolved: meta-pytorch#1255

Ensure `cargo test -p monarch_rdma` runs on OSS CI

Differential Revision: D82699014

Author: dstaay-fb

.github/workflows/test-cuda.yml

@@ -47,6 +47,10 @@ jobs:
         # Install the built wheel from artifact
         install_wheel_from_artifact
 
+        # Install Rust toolchain for tests
+        curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+        source ~/.cargo/env
+
         # tests the type_assert statements in test_python_actor are correct
         # pyre currently does not check these assertions
         pyright python/tests/test_python_actors.py
@@ -56,3 +60,5 @@ jobs:
         # TODO(meriksen): temporarily disabled to unblock lands while debugging
         # mock CUDA issues on the OSS setup
         # python python/tests/test_mock_cuda.py
+
+        cargo test -p monarch_rdma