.gitlab-ci.yml: Move build docs to fix artifacts

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

.gitlab-ci.yml

@@ -50,6 +50,9 @@ build-docs:
   script:
     - !reference [.workspace, script]
     - !reference [.build-docs, script]
+    # Artifatcs are relative to CI_PROJECT_DIR so we need to provide the build
+    # docs there.
+    - mv "$SCRATCH_DIR"/docs/build/ "$CI_PROJECT_DIR" || true
   artifacts:
     paths:
       - build