add docker-compose file to tune database

docker-compose.pgsql-tuning.yml

@@ -0,0 +1,36 @@
+services:
+  db:
+    command:
+      - "postgres"
+      - "-c"
+      - "max_connections=40"
+      - "-c"
+      - "shared_buffers=1GB"
+      - "-c"
+      - "effective_cache_size=3GB"
+      - "-c"
+      - "maintenance_work_mem=512MB"
+      - "-c"
+      - "checkpoint_completion_target=0.9"
+      - "-c"
+      - "wal_buffers=16MB"
+      - "-c"
+      - "default_statistics_target=500"
+      - "-c"
+      - "random_page_cost=1.1"
+      - "-c"
+      - "effective_io_concurrency=200"
+      - "-c"
+      - "work_mem=6553kB"
+      - "-c"
+      - "min_wal_size=4GB"
+      - "-c"
+      - "max_wal_size=16GB"
+      - "-c"
+      - "max_worker_processes=4"
+      - "-c"
+      - "max_parallel_workers_per_gather=2"
+      - "-c"
+      - "max_parallel_workers=4"
+      - "-c"
+      - "max_parallel_maintenance_workers=2"