DONE: consolidate to use .env instead of .env.prod

be/docker/production/docker-compose.production.yml

@@ -16,7 +16,7 @@ services:
     volumes:
       - app-storage-production:/var/www/storage
       - app-logs-production:/var/www/storage/logs
-      - ./.env.production:/var/www/.env:ro
+      - ./.env:/var/www/.env:ro
       - ${NGINX_CONF:-./be/docker/production/nginx/nginx.conf}:/etc/nginx/nginx.conf:ro
     networks:
       - mykopkb-production-network
@@ -55,6 +55,34 @@ services:
         max-size: "10m"
         max-file: "3"
 
+  db:
+    image: postgres:17
+    container_name: mykopkb-postgres-production
+    restart: unless-stopped
+    ports:
+      - "${DB_PORT:-5432}:5432"
+    environment:
+      - POSTGRES_ROOT_PASSWORD=${DB_ROOT_PASSWORD}
+      - POSTGRES_DATABASE=${DB_DATABASE}
+      - POSTGRES_USER=${DB_USERNAME}
+      - POSTGRES_PASSWORD=${DB_PASSWORD}
+    volumes:
+      - db-data-production:/var/lib/postgres
+      - ./be/docker/postgres/conf.d:/etc/postgres/conf.d:ro
+    networks:
+      - mykopkb-production-network
+    healthcheck:
+      test: ["CMD", "postgres", "ping", "-h", "localhost"]
+      interval: 15s
+      timeout: 10s
+      retries: 5
+      start_period: 30s
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "10m"
+        max-file: "3"
+
   redis:
     image: redis:8
     container_name: mykopkb-redis-production
@@ -86,5 +114,7 @@ volumes:
     driver: local
   app-logs-production:
     driver: local
+  db-data-production:
+    driver: local
   redis-data-production:
     driver: local