try single curly braces

.github/workflows/pr.yaml

@@ -90,7 +90,7 @@ jobs:
       build_type: pull-request
       package-name: raft_dask
       package-dir: python/raft-dask
-      before-wheel: "RAPIDS_PY_WHEEL_NAME='pylibraft_${{ \${{CU_VER}} }}' rapids-download-wheels-from-s3 ./local-pylibraft && python -m pip install --no-deps ./local-pylibraft/pylibraft*.whl"
+      before-wheel: "RAPIDS_PY_WHEEL_NAME=pylibraft_${{ '${CU_VER}' }} rapids-download-wheels-from-s3 ./local-pylibraft && python -m pip install --no-deps ./local-pylibraft/pylibraft*.whl"
       skbuild-configure-options: "-DRAFT_BUILD_WHEELS=ON -DDETECT_CONDA_ENV=OFF -DFIND_RAFT_CPP=OFF"
   wheel-tests-raft-dask:
     needs: wheel-build-raft-dask
@@ -100,7 +100,7 @@ jobs:
       build_type: pull-request
       package-name: raft_dask
       # Always want to test against latest dask/distributed.
-      test-before-amd64: "RAPIDS_PY_WHEEL_NAME='pylibraft_${{ \${{CU_VER}} }}' rapids-download-wheels-from-s3 ./local-pylibraft-dep && pip install --no-deps ./local-pylibraft-dep/pylibraft*.whl && pip install git+https://github.com/dask/[email protected] git+https://github.com/dask/[email protected] git+https://github.com/rapidsai/[email protected]"
-      test-before-arm64: "RAPIDS_PY_WHEEL_NAME='pylibraft_${{ \${{CU_VER}} }}' rapids-download-wheels-from-s3 ./local-pylibraft-dep && pip install --no-deps ./local-pylibraft-dep/pylibraft*.whl && pip install git+https://github.com/dask/[email protected] git+https://github.com/dask/[email protected] git+https://github.com/rapidsai/[email protected]"
+      test-before-amd64: "RAPIDS_PY_WHEEL_NAME=pylibraft_${{ '${CU_VER}' }} rapids-download-wheels-from-s3 ./local-pylibraft-dep && pip install --no-deps ./local-pylibraft-dep/pylibraft*.whl && pip install git+https://github.com/dask/[email protected] git+https://github.com/dask/[email protected] git+https://github.com/rapidsai/[email protected]"
+      test-before-arm64: "RAPIDS_PY_WHEEL_NAME=pylibraft_${{ '${CU_VER}' }} rapids-download-wheels-from-s3 ./local-pylibraft-dep && pip install --no-deps ./local-pylibraft-dep/pylibraft*.whl && pip install git+https://github.com/dask/[email protected] git+https://github.com/dask/[email protected] git+https://github.com/rapidsai/[email protected]"
       test-unittest: "python -m pytest ./python/raft-dask/raft_dask/test"
       test-smoketest: "python ./ci/wheel_smoke_test_raft_dask.py"