Add Windows Server 2025 variant

Author: yosifkit

1.10/windows/windowsservercore-ltsc2025/Dockerfile

@@ -41,6 +41,7 @@
     "variants": [
       "bookworm",
       "bullseye",
+      "windows/windowsservercore-ltsc2025",
       "windows/windowsservercore-ltsc2022",
       "windows/windowsservercore-1809"
     ],
@@ -94,6 +95,7 @@
       "bullseye",
       "alpine3.21",
       "alpine3.20",
+      "windows/windowsservercore-ltsc2025",
       "windows/windowsservercore-ltsc2022",
       "windows/windowsservercore-1809"
     ],

1.11/windows/windowsservercore-ltsc2025/Dockerfile

@@ -110,6 +110,7 @@ for version in "${versions[@]}"; do
 				| "alpine" + .
 			else empty end,
 			if .arches | has("windows-amd64") then
+				"ltsc2025",
 				"ltsc2022",
 				"1809",
 				empty