fix: Update Justfile and compose.yml for improved database build and configuration

Justfile

@@ -37,7 +37,7 @@ publish db=VARIANT:
 
 # Start the database and wait until it's healthy
 db-up db=VARIANT:
-  docker build {{db}}
+  just build {{db}}
   docker compose -f {{db}}/compose.yml up -d --wait
 
 # Stop the database container but preserve data volumes

postgres/compose.yml

@@ -7,8 +7,7 @@ services:
       POSTGRES_USER: ${POSTGRES_USER:-postgres}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}
       POSTGRES_DB: ${POSTGRES_DB:-postgres}
-    ports:
-      - "${POSTGRES_PORT:-5432}:5432"
+      POSTGRES_PORT: ${POSTGRES_PORT:-5432}
     volumes:
       - postgres_data:/var/lib/postgresql
     healthcheck: