chore(windows): build from a Windows 2025 agent by default

Author: lemeurherve

Jenkinsfile

@@ -7,22 +7,30 @@ properties([
 ])
 
 def agentSelector(String imageType) {
-    // Linux agent
-    if (imageType == 'linux') {
-        // This function is defined in the jenkins-infra/pipeline-library
-        if (infra.isTrusted()) {
-            return 'linux'
-        } else {
-            // Need Docker and a LOT of memory for faster builds (due to multi archs) or fallback to linux (trusted.ci)
-            return 'docker-highmem'
-        }
-    }
-    // Windows Server Core 2022 agent
-    if (imageType.contains('2022')) {
-        return 'windows-2022'
+    def agentTemplateLabel
+    switch (imageType) {
+        // Linux
+        case ~/linux|alpine*|debian*|rhel*/:
+            // Need Docker and a LOT of memory for faster builds (due to multi archs)
+            agentTemplateLabel = 'docker-highmem'
+            // Fallback to linux on trusted.ci
+            if (infra.isTrusted()) {
+                agentTemplateLabel = 'linux'
+            }
+            break
+
+        // TODO: to be removed later, see https://github.com/jenkins-infra/helpdesk/issues/4954
+        // nanoserver 1809, ltsc2019 and windowservercore ltsc2019
+        case ~/.*9/:
+            agentTemplateLabel = 'windows-2019'
+            break
+
+        // Build on Windows 2025 agent by default
+        default:
+            agentTemplateLabel = 'windows-2025'
+            break
     }
-    // Windows Server Core 2019 agent (for nanoserver 1809 & ltsc2019 and for windowservercore ltsc2019)
-    return 'windows-2019'
+    return agentTemplateLabel
 }
 
 // Ref. https://github.com/jenkins-infra/pipeline-library/pull/917
@@ -93,7 +101,7 @@ def parallelStages = [failFast: false]
                             }
                         } else {
                             // ci.jenkins.io builds (e.g. no publication)
-                            stage('Build') {
+                            stage("Build on a '${resolvedAgentLabel}' agent" {
                                 if (isUnix()) {
                                     sh './build.sh'
                                 } else {