feat(pkg/db): postgres database

docker-compose.yml

@@ -0,0 +1,17 @@
+version: '3'
+
+services:
+
+  flucky-db:
+    environment:
+      - PGTZ=${TZ}
+      - POSTGRES_PASSWORD=${PG_PASSWORD}
+      - POSTGRES_USER=${PG_USER}
+      - POSTGRES_DB=${PG_NAME}
+      - TZ=${TZ}
+    image: postgres:11.5-alpine
+    ports:
+      - ${PG_EXTERN_PORT}:${PG_INTERN_PORT}/tcp
+    restart: always
+    volumes:
+      - /etc/localtime:/etc/localtime:ro