unbreak C# build_package targets

tools/run_tests/artifacts/build_package_csharp.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Copyright 2022 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -ex
+
+# Nothing to do here. C# has been removed from this repository. This script is a placeholder
+# to prevent C# tests from becoming red (until they get eventually disabled).

tools/run_tests/artifacts/package_targets.py

@@ -95,7 +95,9 @@ class CSharpPackage:
                 os.getenv('GRPC_CSHARP_BUILD_SINGLE_PLATFORM_NUGET', '')
         }
 
-        build_script = 'src/csharp/build_unitypackage.sh' if self.unity else 'src/csharp/build_nuget.sh'
+        # C# has been removed from the repo. Provide a dummy script to prevent
+        # the build task from failing.
+        build_script = 'tools/run_tests/artifacts/build_package_csharp.sh'
 
         if self.platform == 'linux':
             return create_docker_jobspec(