fix(ssh): Only enable SSH on IPv4

terraform/ssh.tf

@@ -5,9 +5,6 @@ data "hcloud_ssh_keys" "all_keys" {
 data "http" "myipv4" {
   url = "https://api4.ipify.org"
 }
-data "http" "myipv6" {
-  url = "https://api6.ipify.org"
-}
 
 resource "hcloud_firewall" "k8s-ssh" {
   name = "k8s-ssh"
@@ -34,7 +31,6 @@ resource "hcloud_firewall" "k8s-ssh" {
     port        = "22"
     source_ips = [
       "${chomp(data.http.myipv4.body)}/32",
-      "${replace(chomp(data.http.myipv6.body), "/^([0-9a-f]+:[0-9a-f]+:[0-9a-f]+:[0-9a-f]+):.*/", "$1")}::/64",
     ]
   }
 }