CI: Fix status check for tools/tests

Without "pipefail", $? have the exit value of `tee`, which should
always be 0. But instead of using "pipefail", do collect the value of
from the test with $PIPESTATUS.

Signed-off-by: Anthony PERARD <anthony.perard@vates.tech>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

automation/scripts/run-tools-tests

@@ -20,7 +20,7 @@ for f in "$1"/*; do
     echo "Running $f"
     printf '  <testcase name="%s">\n' "$f" >> "$xml_out"
     "$f" 2>&1 | tee /tmp/out
-    ret=$?
+    ret=${PIPESTATUS[0]}
     if [ "$ret" -ne 0 ]; then
         echo "FAILED: $f"
         failed+=" $f"