build: Adds Windows kube-proxy image

Adds the KUBE_BUILD_WINDOWS option to make release-images and quick-release-images,
which will allow it to build the a Windows kube-proxy image as well. That image can
then be used with Windows Host Process Containers to start the kube-proxy
service on Windows nodes.

build/server-image/kube-proxy/Dockerfile_windows

@@ -0,0 +1,28 @@
+# Copyright 2024 The Kubernetes 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.
+
+# Dockerfile used for the server images.
+
+# Note that the image doesn't really matter for Windows Host Process containers
+# # the files in the image are copied to C:\hpc (containerd 1.7+) on the host
+# # but the file system is the Host, NOT the container
+ARG BASEIMAGE
+ARG BINARY
+
+FROM $BASEIMAGE
+
+ENV PATH="C:\Windows\system32;C:\Windows;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;"
+COPY ${BINARY} /kube-proxy/${BINARY}
+
+ENTRYPOINT ["c:/hpc/kube-proxy/kube-proxy.exe"]