docs: Postgres connection timeout (n8n-io#2452)

Author: ivov

docs/hosting/configuration/environment-variables/database.md

@@ -33,6 +33,7 @@ This page outlines environment variables to configure your chosen database for y
 | `DB_POSTGRESDB_USER`<br>/`_FILE` | String | `postgres` | The PostgreSQL user. |
 | `DB_POSTGRESDB_PASSWORD`<br>/`_FILE` | String | - | The PostgreSQL password. |
 | `DB_POSTGRESDB_POOL_SIZE`<br>/`_FILE` | Number | `2` | Control how many parallel open Postgres connections n8n should have. Increasing it may help with resource utilization, but too many connections may degrade performance. |
+| `DB_POSTGRESDB_CONNECTION_TIMEOUT`<br>/`_FILE` | Number | `20000` | Postgres connection timeout (ms).
 | `DB_POSTGRESDB_SCHEMA`<br>/`_FILE` | String | `public` | The PostgreSQL schema. |
 | `DB_POSTGRESDB_SSL_CA`<br>/`_FILE` | String | - | The PostgreSQL SSL certificate authority. |
 | `DB_POSTGRESDB_SSL_CERT`<br>/`_FILE` | String | - | The PostgreSQL SSL certificate. |