Fix testing cache policy

.gitlab-ci.yml

@@ -127,6 +127,8 @@ unit-testing-1.12.3:
   - .using-ci-base
   stage: test
   cache: &testing_cache_policy
+    <<: *global_cache_policy
+    policy: pull
   services: &testing_services
   - name: postgres:13-alpine
     alias: postgres
@@ -150,8 +152,6 @@ unit-testing-1.15.7-otp-25:
   image: git.pleroma.social:5050/pleroma/pleroma/ci-base:elixir-1.15-otp25
   allow_failure: true
   cache: *testing_cache_policy
-    <<: *global_cache_policy
-    policy: pull
   services: *testing_services
   script: *testing_script