Fix artifacts for build:vio

coq#17785 changed the artifact paths but
this job wasn't adapted.

Because of the workaround for
https://gitlab.com/gitlab-org/gitlab/issues/202505 this wasn't detected.

.gitlab-ci.yml

@@ -168,7 +168,7 @@ before_script:
     # put || exit 0 as a workaround if https://gitlab.com/gitlab-org/gitlab/issues/202505 reoccurs
     # the validate:vio job is sometimes started before build:vio, without artifacts
     # we ignore these spurious errors so if the job fails it's a real error
-    - cd _install_ci
+    - if test "$CI_JOB_NAME" = "validate:vio"; then tar xfj _build.tar.bz2 && cd _build/install/default; else cd _install_ci; fi
     - find lib/coq/ -name '*.vo' -fprint0 vofiles
     - xargs -0 --arg-file=vofiles bin/coqchk -o -m -coqlib lib/coq/ > ../coqchk.log 2>&1 || touch coqchk.failed
     - tail -n 1000 ../coqchk.log # the log is too big for gitlab so pipe to a file and display the tail
@@ -333,7 +333,6 @@ build:base+async:
 build:vio:
   extends: .build-template:base:dev
   variables:
-    COQ_EXTRA_CONF: "-native-compiler no"
     COQ_DUNE_EXTRA_OPT: "-vio"
     DUNE_TARGET: "vio world"
   after_script:
@@ -342,11 +341,6 @@ build:vio:
   only:
     variables:
       - ($FULL_CI == "true" && $UNRELIABLE =~ /enabled/)
-  artifacts:
-    when: always
-    paths:
-      - _install_ci
-      - dmesg.txt
 
 lint:
   stage: build