ci-dockerfiles-deployment/report.sh: Dump disk usage at the end

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I879f68bf76ec77b0e5de540aa005d436c4f4e4a8
diff --git a/ci-dockerfiles-deployment/report.sh b/ci-dockerfiles-deployment/report.sh
index fe0ac53..665a840 100644
--- a/ci-dockerfiles-deployment/report.sh
+++ b/ci-dockerfiles-deployment/report.sh
@@ -8,6 +8,7 @@
 {
     rm -rf ${HOME}/.docker
     rm -f ${WORKSPACE}/{log,config.json,version.txt}
+    df -h
 }
 
 update_images=$(find -type f -name .docker-tag)