CI: drop log.txt from integration job artifacts

We run pmbootstrap with --details-to-stdout now, so this isn't needed.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>

.gitlab-ci.yml

@@ -108,9 +108,3 @@ integration:
     - echo "permit nopass build" > /etc/doas.d/ci-user.conf
   script:
     - ".ci/integration.sh"
-  after_script:
-    - "cp /home/build/.local/var/pmbootstrap/log.txt ."
-  artifacts:
-    when: on_failure
-    paths:
-      - "log.txt"