Update BootBuildImage to support Gradle's configuration cache

See gh-22922

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/bundling/BootBuildImage.java

@@ -59,6 +59,10 @@ public class BootBuildImage extends DefaultTask {
 
 	private static final String BUILDPACK_JVM_VERSION_KEY = "BP_JVM_VERSION";
 
+	private final String projectName;
+
+	private final Property<String> projectVersion;
+
 	private RegularFileProperty jar;
 
 	private Property<JavaVersion> targetJavaVersion;
@@ -84,6 +88,9 @@ public class BootBuildImage extends DefaultTask {
 	public BootBuildImage() {
 		this.jar = getProject().getObjects().fileProperty();
 		this.targetJavaVersion = getProject().getObjects().property(JavaVersion.class);
+		this.projectName = getProject().getName();
+		this.projectVersion = getProject().getObjects().property(String.class);
+		this.projectVersion.set(getProject().provider(() -> getProject().getVersion().toString()));
 	}
 
 	/**
@@ -318,12 +325,11 @@ public class BootBuildImage extends DefaultTask {
 		if (StringUtils.hasText(this.imageName)) {
 			return ImageReference.of(this.imageName);
 		}
-		ImageName imageName = ImageName.of(getProject().getName());
+		ImageName imageName = ImageName.of(this.projectName);
-		String version = getProject().getVersion().toString();
+		if ("unspecified".equals(this.projectVersion.get())) {
-		if ("unspecified".equals(version)) {
 			return ImageReference.of(imageName);
 		}
-		return ImageReference.of(imageName, version);
+		return ImageReference.of(imageName, this.projectVersion.get());
 	}
 
 	private BuildRequest customize(BuildRequest request) {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/bundling/BootBuildImageIntegrationTests.java

@@ -46,7 +46,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Andy Wilkinson
  * @author Scott Frederick
  */
-@GradleCompatibility
+@GradleCompatibility(configurationCache = true)
 @DisabledIfDockerUnavailable
 class BootBuildImageIntegrationTests {