Apply artifact expiration directly to jobs

Works around the issue with Gitlab CI not supporting the expire_in
property on the default job properties, as Steelt found.

https://gitlab.com/gitlab-org/gitlab/-/issues/404563

.gitlab-ci.yml

@@ -15,5 +15,3 @@ stages:
 
 default:
   interruptible: true
-  artifacts:
-    expire_in: 1 day

.gitlab/ci/jobs/alpine-3-gcc.yml

@@ -19,6 +19,7 @@ Alpine 3 GCC:
       - "build.alpine3/src/config.h"
     expose_as: "Apline-3"
     name: "$CI_PROJECT_PATH_SLUG-$CI_COMMIT_REF_SLUG-$CI_COMMIT_SHORT_SHA-Apline-3"
+    expire_in: 1 day
 
   before_script:
     - - |

.gitlab/ci/templates/srb2ci.yml

@@ -15,6 +15,9 @@
         - build/apt-cache
       unprotect: true
 
+  artifacts:
+    expire_in: 1 day
+
   before_script:
     - - |
          # debconf