move services & image in test section

.gitlab-ci.yml

-services: 
-  - name: postgis/postgis:17-3.5
-    alias: postgres
-
 stages:
   - test
 
@@ -26,6 +22,10 @@ cache:
 
 test:
   stage: test
+  image: postgis/postgis:17-3.5
+  services: 
+    - name: postgis/postgis:17-3.5
+      alias: postgres
   before_script:
     # Install dependencies and create associated cache dirs
     - mkdir -p "${APT_STATE_LISTS}/partial"