fix(ci): do not print the build.log on failure

The build output will have already been printed on the console so this
only repeats information that is already there and in somewhat more
unusual failures only hides the real problem with lines upon lines of
output. If the build log is needed for debugging then reading the
build.log is more concise anyway. So drop the print and only leave the
path.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I087ac9d66c1c7460c186f21d0b53f09b6db98370
diff --git a/script/build_package.sh b/script/build_package.sh
index d2220fd..cbe1b02 100755
--- a/script/build_package.sh
+++ b/script/build_package.sh
@@ -316,10 +316,7 @@
 	fi
 
 	echo
-	echo "Build failed! Full build log below:"
-	echo "[...]"
-	echo
-	cat "$build_log"
+	echo "Build failed!"
 	echo
 	echo "See $log_path for full output"
 	echo