feat: Postgres max connections (#7067)

docker/docker-compose.middleware.yaml

@@ -9,6 +9,12 @@ services:
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-difyai123456}
       POSTGRES_DB: ${POSTGRES_DB:-dify}
       PGDATA: ${PGDATA:-/var/lib/postgresql/data/pgdata}
+    command: >
+      postgres -c 'max_connections=${POSTGRES_MAX_CONNECTIONS:-100}'
+               -c 'shared_buffers=${POSTGRES_SHARED_BUFFERS:-128MB}'
+               -c 'work_mem=${POSTGRES_WORK_MEM:-4MB}'
+               -c 'maintenance_work_mem=${POSTGRES_MAINTENANCE_WORK_MEM:-64MB}'
+               -c 'effective_cache_size=${POSTGRES_EFFECTIVE_CACHE_SIZE:-4096MB}'
     volumes:
       - ./volumes/db/data:/var/lib/postgresql/data
     ports: