[infra] Preset signal port on templates (#5004)

When passing certificates to signal, it will select port 443 when no port is supplied. This changes forces port 80.

infrastructure_files/docker-compose.yml.tmpl

@@ -53,7 +53,8 @@ services:
     command: [
       "--cert-file", "$NETBIRD_MGMT_API_CERT_FILE",
       "--cert-key", "$NETBIRD_MGMT_API_CERT_KEY_FILE",
-      "--log-file", "console"
+      "--log-file", "console",
+      "--port", "80"
     ]
 
   # Relay