Merge branch 'archive_gitlab_issue' into 'master'

Add a new issue template for adding an Archive Mirror

See merge request archlinux/infrastructure!183

.gitlab/issue_templates/ArchiveMirror.yml

+<!--
+This template should be used for adding a new Arch Linux Archive Mirror.
+-->
+
+# Add a new Archive Mirror Server
+
+## Details
+
+- **Server name**: <!-- Put server hostname here -->
+
+## Steps
+
+- [ ] Verify if the new mirror has enough diskspace for hosting the archive
+- [ ] Add a new domain in terraform
+- [ ] Add the new server to `archive_mirrors` in `hosts`
+- [ ] Run the dbscripts role to allow the new archive mirror to sync
+- [ ] Run the `archive-mirrors.yml` playbook
+- [ ] Run `certbot certonly --email webmaster@archlinux.org --agree-tos --rsa-key-size 4096 --renew-by-default --webroot -w /var/lib/letsencrypt/ -d <domain-name>`