IRC: allow plaintext server links (Anope internal cluster)

apps/irc/irc.yaml

@@ -162,6 +162,11 @@ stringData:
         key "/app/conf/tls/server.key.pem";
         trusted-ca-file "/etc/ssl/certs/ca-certificates.crt";
       }
+
+      /* Allow plaintext for server-to-server links (Anope is internal) */
+      plaintext-policy {
+        server allow;
+      }
     }
 ---
 # Anope configuration