Serialize 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")
@@ -16,6 +18,12 @@ data class ImageTarget(
   val windows: Boolean = true
 )
 
+abstract class DockerBuildService : BuildService<BuildServiceParameters.None>
+
+gradle.sharedServices.registerIfAbsent("dockerBuildService", DockerBuildService::class.java) {
+  maxParallelUsages.set(1)
+}
+
 val extraTag = findProperty("extraTag")
   ?: java.time.format.DateTimeFormatter.ofPattern("yyyyMMdd.HHmmSS").format(java.time.LocalDateTime.now())
 
@@ -352,6 +360,8 @@ fun configureImage(
     group = "build"
     description = "Builds Docker image with $server $version on JDK $jdk-$vm${if (isWindows) " on Windows" else ""}"
 
+    usesService(gradle.sharedServices.registrations["dockerBuildService"].service)
+
     inputDir.set(dockerWorkingDir)
     images.add(image)
     dockerFile.set(File(dockerWorkingDir.get().asFile, dockerFileName))