Add comments about sudo and ulimit

build.sh

@@ -53,5 +53,7 @@ dockerbuild()
 if [ ! -z "$BUILD_IN_DOCKER" ]; then
     dockerbuild $args
 else
+   # Run under sudo so we can set ulimit
+    # See https://github.com/dotnet/core-eng/issues/14808
     sudo $DIR/run-build.sh $args
 fi

run-build.sh

@@ -26,6 +26,7 @@ CUSTOM_BUILD_ARGS=
 [ -z $NUGET_PACKAGES ] && export NUGET_PACKAGES="$REPOROOT/.nuget/packages"
 
 # Set max number of files open, helps avoid errors during NuGet restore
+# See https://github.com/dotnet/core-eng/issues/14808
 ulimit -n 16384
 
 args=( )