fix(system/sshd): use HashiCorp Vault address from variable

Signed-off-by: Matej Focko <me@mfocko.xyz>

roles/system/sshd/tasks/trusted_ca.yml

@@ -1,7 +1,7 @@
 ---
 - name: Fetch the public key from the HashiCorp Vault
   ansible.builtin.get_url:
-    url: https://hvault.mfocko.xyz/v1/ssh/public_key
+    url: https://{{ hashicorp_vault_address }}/v1/ssh/public_key
     dest: /etc/ssh/sshd_config.d/trusted-user-ca-keys.pem
     mode: 0600
     owner: root