Use single-arch image to test platform mismatch detection

See gh-44059

Author: mhalbritter

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

@@ -518,7 +518,7 @@ void failsWithIncompatiblePlatform() throws IOException {
 		writeMainClass();
 		BuildResult result = this.gradleBuild.buildAndFail("bootBuildImage");
 		assertThat(result.getOutput()).contains(
-				"Image platform mismatch detected. The configured platform 'invalid/platform' is not supported by the image 'ghcr.io/spring-io/spring-boot-cnb-test-builder:0.0.1'. Requested platform 'invalid/platform' but got 'linux/amd64'");
+				"Image platform mismatch detected. The configured platform 'invalid/platform' is not supported by the image 'ghcr.io/spring-io/spring-boot-cnb-test-builder:0.0.3-amd64'. Requested platform 'invalid/platform' but got 'linux/amd64'");
 	}
 
 	private void writeMainClass() throws IOException {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/dockerTest/resources/org/springframework/boot/gradle/tasks/bundling/BootBuildImageIntegrationTests-failsWithIncompatiblePlatform.gradle

@@ -4,8 +4,6 @@ plugins {
 }
 
 bootBuildImage {
-	builder = "ghcr.io/spring-io/spring-boot-cnb-test-builder:0.0.1"
-	runImage = "paketobuildpacks/run-jammy-tiny"
-	buildpacks = ["ghcr.io/spring-io/spring-boot-test-info:0.0.1"]
+	builder = "ghcr.io/spring-io/spring-boot-cnb-test-builder:0.0.3-amd64"
 	imagePlatform = "invalid/platform"
 }