ci: bump archiving timeout, list artifacts (#6539)

We suspect in some cases the archive is bigger than normally.
I'm adding a listing of the file sizes to catch that.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

ci/Jenkinsfile

@@ -143,13 +143,17 @@ pipeline {
           } }
         }
       }
-      post { always { timeout(5) {
+      post {
+        always { timeout(10) {
+          /* DEBUG: Show file sizes to catch too big ones. */
+          sh 'ls -hl *.tar.gz'
           archiveArtifacts(
             artifacts: '*.tar.gz',
             excludes: '**/geth-*.tar.gz',  /* `scripts/geth_binaries.sh` */
             allowEmptyArchive: true
           )
-      } } }
+        } }
+      }
     }
   }