Combine sync{archive,debug,riscv} into mirrorsync

These roles are very similar and can be merged into a single new role.

Note: The archive mirror is changed from a 4-hour sync to minutely for conformity with the other two mirrors. In practice this doesn't matter as it was already taking over 4 hours to finish and was starting again right after its previous run.

playbooks/mirrors.yml

@@ -10,9 +10,9 @@
     - { role: certbot }
     - { role: nginx }
     - { role: syncrepo, tags: ['nginx'] }
+    - { role: mirrorsync }
     - { role: archweb, when: archweb_mirrorcheck_locations is defined, archweb_site: false, archweb_services: false, archweb_mirrorcheck: true }
     - { role: prometheus_exporters }
     - { role: promtail }
     - { role: fail2ban }
-    - { role: mirrorsync }
     - { role: geo_dns, when: "'geo_mirrors' in group_names" }