Remove invalid cache for (ICPC) ISO

During the WFs updating once per hour (so once per debugging) should be
fine and make sure the machines stay in the same state if SysOps
upgrades a package.

Author: vmcj

provision-contest/ansible/roles/base_packages/tasks/main.yml

@@ -40,6 +40,12 @@
   notify: Run apt update
   when: dpkg_architectures.stdout.find('i386') != -1
 
+- name: Update cache if this is our first run
+  apt:
+    upgrade: true
+    update_cache: true
+    cache_valid_time: 3600
+
 - name: Flush handlers
   meta: flush_handlers