Serialize Windows servlet image builds

Author: trask

smoke-tests/images/servlet/build.gradle.kts

@@ -1,5 +1,7 @@
 import com.bmuschko.gradle.docker.tasks.image.DockerBuildImage
 import com.bmuschko.gradle.docker.tasks.image.DockerPushImage
+import org.gradle.api.services.BuildService
+import org.gradle.api.services.BuildServiceParameters
 
 plugins {
   id("otel.spotless-conventions")
@@ -16,11 +18,20 @@ data class ImageTarget(
   val windows: Boolean = true
 )
 
+abstract class WindowsDockerBuildService : BuildService<BuildServiceParameters.None>
+
 val extraTag = findProperty("extraTag")
   ?: java.time.format.DateTimeFormatter.ofPattern("yyyyMMdd.HHmmSS").format(java.time.LocalDateTime.now())
 
 val latestJava = "25" // renovate(java-version)
 
+gradle.sharedServices.registerIfAbsent(
+  "windowsDockerBuildService",
+  WindowsDockerBuildService::class.java
+) {
+  maxParallelUsages.set(1)
+}
+
 // Each line under appserver describes one matrix of (version x vm x jdk), dockerfile key overrides
 // Dockerfile name, args key passes raw arguments to docker build
 val targets = mapOf(
@@ -352,6 +363,10 @@ fun configureImage(
     group = "build"
     description = "Builds Docker image with $server $version on JDK $jdk-$vm${if (isWindows) " on Windows" else ""}"
 
+    if (isWindows) {
+      usesService(gradle.sharedServices.registrations["windowsDockerBuildService"].service)
+    }
+
     inputDir.set(dockerWorkingDir)
     images.add(image)
     dockerFile.set(File(dockerWorkingDir.get().asFile, dockerFileName))