Merge branch '2.6.x' into 2.7.x

Closes gh-31824

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/configuration/DockerConfiguration.java

@@ -102,4 +102,9 @@ public final class DockerConfiguration {
 				new DockerRegistryUserAuthentication(username, password, url, email), this.bindHostToBuilder);
 	}
 
+	public DockerConfiguration withEmptyPublishRegistryAuthentication() {
+		return new DockerConfiguration(this.host, this.builderAuthentication,
+				new DockerRegistryUserAuthentication("", "", "", ""));
+	}
+
 }