Swamp the log with debug

OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/appstream-glib?expand=0&rev=51

openSUSE-appstream-process

@@ -17,12 +17,13 @@ TMPDIR=$(mktemp -d)
   --origin=appdata					\
   --basename=appdata					\
   --packages-dir=${SRC}					\
-  --output-dir=${DEST}
+  --output-dir=${DEST} 2>&1 | tee $TMPDIR/as-builder.log
 
 RET=$?
 
 if [ $RET -ne 0 ]; then
   # The appstream-builder failed, exit with an error code, so prod builder knows about it
+  cat $TMPDIR/as-builder.log
   exit $RET
 fi