try to get build times as an artifact

.gitlab-ci.yml

@@ -4,4 +4,7 @@ buildjob:
   tags:
   - coq
   script:
-  - make -j4 TIMED=y
+  - make -j8 TIMED=y | tee /dev/stdout | egrep "[a-zA-Z0-9-_/]+ \(user: [0-9]" > build-time.txt
+  artifacts:
+    paths:
+    - build-time.txt