Include cmake/ in cudaq realtime sparse checkout; fix test (#669)

cuda-quantum 
([#4870](NVIDIA/cuda-quantum#4870)) made
realtime/unittests include cmake/modules/CUDAQGtestDiscovery.cmake from
the repo root, which the realtime-only sparse checkout in CI does not
fetch, breaking configure with "include could not find requested file".
Fetch cmake/ alongside realtime/ in both places that clone the realtime
sources.

---------

Signed-off-by: Ben Howe <bhowe@nvidia.com>

Author: bmhowe23

.github/actions/build-lib/build_qec.sh

@@ -20,7 +20,7 @@ if [ -z "$CUDAQ_REALTIME_ROOT" ]; then
   git clone --filter=blob:none --no-checkout "https://github.com/${CUDAQ_REPO}.git" cudaq-realtime-src
   cd cudaq-realtime-src
   git sparse-checkout init --cone
-  git sparse-checkout set realtime
+  git sparse-checkout set realtime cmake
   git checkout "$CUDAQ_REF"
 
   # Install build tools and DOCA/Holoscan SDK for HSB.

.github/workflows/all_libs_release.yaml

@@ -116,7 +116,7 @@ jobs:
           git clone --filter=blob:none --no-checkout "https://github.com/${CUDAQ_REPO}.git" cudaq-realtime-src
           cd cudaq-realtime-src
           git sparse-checkout init --cone
-          git sparse-checkout set realtime
+          git sparse-checkout set realtime cmake
           git checkout "$CUDAQ_REF"
           cd realtime && mkdir -p build && cd build
           cmake -G Ninja -DCMAKE_INSTALL_PREFIX=$CUDAQ_REALTIME_ROOT ..

libs/qec/python/tests/test_decoding_config.py

@@ -577,7 +577,9 @@ def test_configure_decoders_from_str_smoke():
     decoder_config.syndrome_size = 3
     decoder_config.H_sparse = [1, 2, 3, -1, 6, 7, 8, -1, -1]
     decoder_config.set_decoder_custom_args(nv)
-    yaml_str = decoder_config.to_yaml_str()
+    multi_decoder_config = qec.multi_decoder_config()
+    multi_decoder_config.decoders = [decoder_config]
+    yaml_str = multi_decoder_config.to_yaml_str()
     # Do not instantiate the decoder if it is not available.
     if not is_nv_qldpc_decoder_available():
         return