Migrate S3 backups from AWS, fix automatic cleanups

The cleanups were broken in that every single archive was also copied to
a shared folder and never deleted from there.

Co-authored-by: Greg Karékinian <greg@karekinian.com>

nodes/gitea-2.json

@@ -32,6 +32,7 @@
       "kosmos_postgresql::hostsfile",
       "kosmos_gitea",
       "kosmos_gitea::default",
+      "kosmos_gitea::backup",
       "kosmos_gitea::act_runner",
       "apt::default",
       "timezone_iii::default",
@@ -47,7 +48,9 @@
       "postfix::_attributes",
       "postfix::sasl_auth",
       "hostname::default",
-      "firewall::default"
+      "firewall::default",
+      "backup::default",
+      "logrotate::default"
     ],
     "platform": "ubuntu",
     "platform_version": "20.04",