[csharp] Include correct build of Grpc.Tools in nightly packages (#33595)

Tentative fix for  #32179.

tools/internal_ci/linux/grpc_publish_packages.sh

@@ -63,7 +63,8 @@ PROTOC_PACKAGES=(
 
 # C#
 UNZIPPED_CSHARP_PACKAGES=$(mktemp -d)
-unzip "$INPUT_ARTIFACTS/csharp_nugets_windows_dotnetcli.zip" -d "$UNZIPPED_CSHARP_PACKAGES"
+# the "_multiplatform" suffix is to fix https://github.com/grpc/grpc/issues/32179
+unzip "$INPUT_ARTIFACTS/csharp_nugets_windows_dotnetcli_multiplatform.zip" -d "$UNZIPPED_CSHARP_PACKAGES"
 CSHARP_PACKAGES=(
   "$UNZIPPED_CSHARP_PACKAGES"/*
   "$INPUT_ARTIFACTS"/grpc_unity_package.[0-9]*.zip

tools/internal_ci/linux/release/grpc_collect_all_packages.sh

@@ -38,6 +38,10 @@ ls -R input_artifacts || true
 # - Ruby's grpc.tools gem also requires protoc plugins build on multiple platforms
 tools/run_tests/task_runner.py -f package linux -j 6 || FAILED="true"
 
+# Fix for https://github.com/grpc/grpc/issues/32179 by avoiding name clash
+# with csharp_nugets_windows_dotnetcli.zip files from previous steps.
+cp artifacts/csharp_nugets_windows_dotnetcli.zip artifacts/csharp_nugets_windows_dotnetcli_multiplatform.zip || true
+
 tools/internal_ci/helper_scripts/store_artifacts_from_moved_src_tree.sh
 
 if [ "$FAILED" != "" ]