docs: geomirrors documentation

Signed-off-by: Leonidas Spyropoulos <artafinde@archlinux.org>

docs/geomirrors.md

+# Geo mirrors
+
+DevOps team maintain a geo mirror across the world. The Geo mirror is public facing on geo.mirror.pkgbuild.com domain and it will resolve the closest to the location of the requester mirror.
+
+## Locations
+
+| Mirror | Location |
+| ----------- | ----------- |
+| https://sydney.mirror.pkgbuild.com/ | Australia |
+| https://europe.mirror.pkgbuild.com/ | Czechia |
+| https://asia.mirror.pkgbuild.com/ | Hong Kong |
+| https://seoul.mirror.pkgbuild.com/ | South Korea |
+| https://london.mirror.pkgbuild.com/ | United Kingdom |
+| https://america.mirror.pkgbuild.com/ | United States |
+
+### Logical split
+The continent mirrors america, asia and europe contain the archive mirrors as well as repository mirrors. The city mirrors have just the repositories hosted.
+
+## Requirements
+- Host with Arch Linux installed
+- root access provided
+- Enough storage to host repos / debugrepos (at least)
+- Bandwidth (depends on location)   
+
+## Adding a new mirror box
+- Add new entries in `hosts` file under `mirrors` and `geo_mirrors` sections
+- Adjust terraform `tf-stage1/archlinux.tf` to include the IPv4 and IPv6 entries of the new server
+- Adjust terraform `tf-stage1/templates.tf` to include the IPv4 and IPv6 entries of the new server as a `NS` record for `geo.mirror.pkgbuild.com`
+- Add a new files in `host_vars`
+    - `host_vars/<fqdn>/misc`
+        Containing all the information for the mirror itself
+    - `host_vars/<fqdn>/vault_wireguard.yml`
+        Containing the wireguard private key in encrypted vault
+
+## Ansible Playbooks execution
+
+| Playbook | Roles | Reason | Hosts (limits) |Comments |
+| ----------- | ----------- | ----------- | ----------- |  ----------- |
+| install_arch | All | Install Arch | | Optional if you can |
+| mirrors.yml | All | Setup mirror | `<fqdn>` | |
+| redirect.archlinux.org.yml | acme_dns_challenge | Make TXT records | | |
+| gemini.archlinux.org.yml | dbscripts | Allow debug repo syncing | | |
+| mirrors.yml | geo_dns | Add new domain to DNS | All other mirrors from geo.mirror | |
+| monitoring.archlinux.org.yml | wireguard,prometheus | Allow loki and prometheus to fetch data | | |
+| archlinux.org.yml | postgres,wireguard | Allow wireguard IP to connect for Mirror check | | Optional see Check Location below |
+
+### Add mirror in geo.mirror.pkgbuild.com
+
+Add mirror IP and FQDN in archweb admin https://archlinux.org/admin/mirrors/mirror/ under the `geo.mirror.pkgbuild.com` entry.
+
+### Check Location (optional)
+
+If you want the server to check for ping and stats create an entry in:
+ https://archlinux.org/admin/mirrors/checklocation/