geo_dns: support per-domain ifurlup check paths

group_vars/all/geo.yml

 geo_acme_dns_challenge_ns: redirect.archlinux.org
 geo_domains:
   - geo.mirror.pkgbuild.com
+geo_health_check_paths:
+  geo.mirror.pkgbuild.com: /lastupdate

roles/geo_dns/templates/geo.yml.j2

@@ -15,13 +15,13 @@ domains:
         - lua:
             ttl: 300
             content: >
-              A "ifurlup('https://{{ domain }}/',
+              A "ifurlup('https://{{ domain }}{{ geo_health_check_paths[domain] | default('/') }}',
               {'{{ groups['geo_mirrors'] | map('extract', hostvars, ['ipv4_address']) | join("', '") }}'},
               {selector='pickclosest', useragent='pdns on {{ inventory_hostname }}'})"
         - lua:
             ttl: 300
             content: >
-              AAAA "ifurlup('https://{{ domain }}/',
+              AAAA "ifurlup('https://{{ domain }}{{ geo_health_check_paths[domain] | default('/') }}',
               {'{{ groups['geo_mirrors'] | map('extract', hostvars, ['ipv6_address']) | join("', '") }}'},
               {selector='pickclosest', useragent='pdns on {{ inventory_hostname }}'})"
       _acme-challenge.{{ domain }}: