fix(postgres-driver): CUBEJS_DB_SSL=false should disable SSL

Author: paveltiunov

packages/cubejs-postgres-driver/driver/PostgresDriver.js

@@ -23,7 +23,7 @@ class PostgresDriver extends BaseDriver {
       port: process.env.CUBEJS_DB_PORT,
       user: process.env.CUBEJS_DB_USER,
       password: process.env.CUBEJS_DB_PASS,
-      ssl: process.env.CUBEJS_DB_SSL ? {} : undefined,
+      ssl: (process.env.CUBEJS_DB_SSL || 'false').toLowerCase() === 'true' ? {} : undefined,
       ...config
     });
     this.pool.on('error', (err) => {