Add Windows (Nano) Server 2025 variants

Makefile

@@ -30,6 +30,7 @@ $(C_TARGETS): hello.c $(MUSL_GCC)
 	$(STRIP) --strip-all --remove-section=.comment '$@'
 	@if [ '$(TARGET_ARCH)' = 'amd64' ]; then \
 		for winVariant in \
+			nanoserver-ltsc2025 \
 			nanoserver-ltsc2022 \
 			nanoserver-1809 \
 		; do \

amd64/hello-world/nanoserver-ltsc2025/Dockerfile

@@ -0,0 +1,3 @@
+FROM mcr.microsoft.com/windows/nanoserver:ltsc2025
+COPY hello.txt C:
+CMD ["cmd", "/C", "type C:\\hello.txt"]

amd64/hello-world/nanoserver-ltsc2025/hello.txt

@@ -0,0 +1,22 @@
+
+Hello from Docker!
+This message shows that your installation appears to be working correctly.
+
+To generate this message, Docker took the following steps:
+ 1. The Docker client contacted the Docker daemon.
+ 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
+    (windows-amd64, nanoserver-ltsc2025)
+ 3. The Docker daemon created a new container from that image which runs the
+    executable that produces the output you are currently reading.
+ 4. The Docker daemon streamed that output to the Docker client, which sent it
+    to your terminal.
+
+To try something more ambitious, you can run a Windows Server container with:
+ PS C:\> docker run -it mcr.microsoft.com/windows/servercore:ltsc2025 powershell
+
+Share images, automate workflows, and more with a free Docker ID:
+ https://hub.docker.com/
+
+For more examples and ideas, visit:
+ https://docs.docker.com/get-started/
+

generate-stackbrew-library.sh

@@ -63,6 +63,7 @@ for arch in "${arches[@]}"; do
 done
 
 for winVariant in \
+	nanoserver-ltsc2025 \
 	nanoserver-ltsc2022 \
 	nanoserver-1809 \
 ; do