fix(builder): avoid return an error if is not possible remove an image

Author: aledbf

builder/templates/builder

@@ -182,4 +182,4 @@ echo
 cd $REPO_DIR
 git gc &>/dev/null
 [ $JOB ] && docker rm -f $JOB &>/dev/null
-docker rmi -f $TMP_IMAGE &>/dev/null
+docker rmi -f $TMP_IMAGE &>/dev/null || true