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.

roles/syncriscv/files/syncriscv

-#!/bin/bash
-
-target="/srv/riscv"
-lock="/var/lock/syncriscv.lck"
-source_url='rsync://archriscv.felixc.at/archriscv'
-lastupdate_url='https://archriscv.felixc.at/.status/lastupdate.txt'
-
-[ ! -d "${target}" ] && mkdir -p "${target}"
-
-exec 9>"${lock}"
-flock -n 9 || exit
-
-rsync_cmd() {
-	local -a cmd=(rsync -rlptH --safe-links --delete-delay --delay-updates
-		"--timeout=600" "--contimeout=60" --no-motd)
-
-	if stty &>/dev/null; then
-		cmd+=(-h -v --progress)
-	else
-		cmd+=("--info=name1")
-	fi
-
-	"${cmd[@]}" "$@"
-}
-
-# if we are called without a tty (cronjob) only run when there are changes
-if ! tty -s && [[ -f "$target/.status/lastupdate.txt" ]] && diff -b <(curl -Ls "$lastupdate_url") "$target/.status/lastupdate.txt" >/dev/null; then
-	exit 0
-fi
-
-rsync_cmd "${source_url}" "${target}"

roles/syncriscv/files/syncriscv.service

-[Unit]
-Description=Synchronize RISC-V mirror
-RequiresMountsFor=/srv/riscv
-Wants=network-online.target
-After=network-online.target
-
-[Service]
-Type=oneshot
-ExecStart=/usr/local/bin/syncriscv
-Nice=19
-IOSchedulingClass=best-effort
-IOSchedulingPriority=7

roles/syncriscv/tasks/main.yml

-- name: Create ssl cert
-  include_role:
-    name: certificate
-  vars:
-    domains: ["{{ riscv_mirror_domain }}"]
-    challenge: "DNS-01"
-
-- name: Install rsync
-  pacman: name=rsync state=present
-
-- name: Install syncriscv script
-  copy: src=syncriscv dest=/usr/local/bin/syncriscv owner=root group=root mode=0755
-
-- name: Install syncriscv units
-  copy: src={{ item }} dest=/etc/systemd/system/{{ item }} owner=root group=root mode=0644
-  with_items:
-    - syncriscv.timer
-    - syncriscv.service
-
-- name: Start and enable syncriscv timer
-  systemd: name=syncriscv.timer enabled=yes state=started daemon_reload=yes
-
-- name: Set up nginx
-  template: src=nginx.d.conf.j2 dest=/etc/nginx/nginx.d/riscv.conf owner=root group=root mode=0644
-  notify: Reload nginx
-  tags: ['nginx']
-
-- name: Make nginx log dir
-  file: path=/var/log/nginx/{{ riscv_mirror_domain }} state=directory owner=root group=root mode=0755