Use correct name for shared runtime param

build/scripts/obtain_dotnet.sh

@@ -32,7 +32,7 @@ install_dotnet () {
             /usr/bin/env bash -s -- --version "${DOTNET_SDK_VERSION}" --install-dir "${DOTNET_PATH}"
 
         curl https://dot.net/v1/dotnet-install.sh | \
-            /usr/bin/env bash -s -- --version "${DOTNET_RUNTIME_VERSION}" --sharedruntime --install-dir "${DOTNET_PATH}"
+            /usr/bin/env bash -s -- --version "${DOTNET_RUNTIME_VERSION}" --shared-runtime --install-dir "${DOTNET_PATH}"
     else
         echo "Skipping download of .NET CLI: Already installed at ${DOTNET_PATH}"
     fi