Merge pull request #2344 from nicolasnoble/yay-we-have-macos-on-jenkins

Adding MacOS support in our run_jenkins script.

tools/jenkins/run_jenkins.sh

@@ -87,6 +87,11 @@ then
   /cygdrive/c/nuget/nuget.exe restore src/csharp/Grpc.sln
 
   python tools/run_tests/run_tests.py -t -l $language -x report.xml
+elif [ "$platform" == "macos" ]
+then
+  echo "building $language on MacOS"
+
+  ./tools/run_tests/run_tests.py -t -l $language -c $config -x report.xml
 else
   echo "Unknown platform $platform"
   exit 1