temporary debug lines in build to debug CI failures

Original commit: elastic/x-pack-elasticsearch@524fa8b5b8

buildSrc/src/main/groovy/org/elastic/gradle/DownloadS3Task.groovy

@@ -51,6 +51,8 @@ class DownloadS3Task extends DefaultTask {
 
     @TaskAction
     public void downloadFromS3() {
+        print 'DownloadS3Task - AWS ACCESS KEY ID: ' + project.awsAccessKey
+        print 'DownloadS3Task - AWS SECRET ACCESS KEY: ' + project.awsSecretKey
         AWSCredentials creds = new BasicAWSCredentials(project.awsAccessKey, project.awsSecretKey)
 
         ClientConfiguration clientConfiguration = new ClientConfiguration();