gitlab-ci.yml: Set artifacts expiration time

The default expiration time for artifacts seems to be very high (30 days?).
Since we only need the artifacts to pass the binaries from one stage to
the next one, we can decrease the expiration time to avoid to spam the
file server too much. Two days should be enough in case someone still wants
to have a look after the pipeline finished.

Message-Id: <20200806161546.15325-1-thuth@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

.gitlab-ci.yml

@@ -74,6 +74,7 @@ build-system-ubuntu:
       moxie-softmmu microblazeel-softmmu mips64el-softmmu
     MAKE_CHECK_ARGS: check-build
   artifacts:
+    expire_in: 2 days
     paths:
       - build
 
@@ -104,6 +105,7 @@ build-system-debian:
       riscv64-softmmu sh4eb-softmmu sparc-softmmu xtensaeb-softmmu
     MAKE_CHECK_ARGS: check-build
   artifacts:
+    expire_in: 2 days
     paths:
       - build
 
@@ -134,6 +136,7 @@ build-system-fedora:
       xtensa-softmmu m68k-softmmu riscv32-softmmu ppc-softmmu sparc64-softmmu
     MAKE_CHECK_ARGS: check-build
   artifacts:
+    expire_in: 2 days
     paths:
       - build
 
@@ -164,6 +167,7 @@ build-system-centos:
       x86_64-softmmu rx-softmmu sh4-softmmu nios2-softmmu
     MAKE_CHECK_ARGS: check-build
   artifacts:
+    expire_in: 2 days
     paths:
       - build