Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -6,6 +6,15 @@ debian:10 gcc-8-17:
 debian:10 clang-6-libcpp-17:
   image: registry.dune-project.org/docker/ci/dune:2.6-debian-10-clang-6-libcpp-17
   script: duneci-standard-test
+  artifacts:
+    paths:
+    - /tmp/reader_writer_test_ascii32.vtu
+    - /tmp/reader_writer_test_bin32.vtu
+    - /tmp/reader_writer_test_zlib32.vtu
+    - /tmp/reader_writer_test_ascii64.vtu
+    - /tmp/reader_writer_test_bin64.vtu
+    - /tmp/reader_writer_test_zlib64.vtu
+    expire_in: 1 day
 
 #debian:9 gcc-6-14:
 #  image: registry.dune-project.org/docker/ci/dune:2.6-debian-9-gcc-6-14