gitlab ci: run update as extra stage

.gitlab-ci.yml

@@ -6,6 +6,7 @@ variables:
 
 stages:
   - generate_date
+  - update
   - build
   - package
 
@@ -18,10 +19,18 @@ generate_date:
       - build.date
     expire_in: 1 day
 
+update:
+  stage: update
+  script:
+    - make -C gluon update GLUON_SITEDIR="$CI_PROJECT_DIR" FFS_BUILD_DATE=$(cat build.date)
+  artifacts:
+    paths:
+      - gluon/
+    expire_in: 1 day
+
 .target:
   stage: build
   script:
-    - make -C gluon update GLUON_SITEDIR="$CI_PROJECT_DIR" FFS_BUILD_DATE=$(cat build.date)
     - make -C gluon GLUON_SITEDIR="$CI_PROJECT_DIR" GLUON_TARGET="$GLUON_TARGET" GLUON_BRANCH=stable FFS_BUILD_DATE=$(cat build.date) V=1 -j`nproc`
   except:
     - tags