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.

The diffs from the following test runs look good:

$ ansible-playbook playbooks/mirrors.yml -CDt mirrorsync
$ ansible-playbook playbooks/debuginfod.archlinux.org.yml -CDt mirrorsync

added 1 commit

• 02b5f6db - Combine sync{archive,debug,riscv} into mirrorsync

Compare with previous version

resolved all threads

Deployed to Geo mirrors + debuginfod.archlinux.org.

added 3 commits

• 02b5f6db...93407f75 - 2 commits from branch master
• 43eb814b - Combine sync{archive,debug,riscv} into mirrorsync

Compare with previous version

enabled an automatic merge when the pipeline for 43eb814b succeeds

mentioned in commit 3c152709

merged

mentioned in issue #301