fix: improve database connection handling in entrypoint

- Add timeout-based PostgreSQL connection check
- Implement max retry attempts (30 attempts, 5s between each)
- Add detailed connection attempt logging
- Maintain compatibility with existing Redis checks
- Exit gracefully if database connection fails after max attempts

References:
docker/entrypoint.sh (lines 1-33)
docker/docker-compose.yaml (lines 331-346)

Dockerfile

@@ -188,26 +188,22 @@ COPY --from=web-builder --chown=user /app/web/public /app/web/public
 ENV FLASK_APP=app.py \
     EDITION=SELF_HOSTED \
     DEPLOY_ENV=PRODUCTION \
-    CONSOLE_API_URL=http://127.0.0.1:7860 \
-    CONSOLE_WEB_URL=http://127.0.0.1:3000 \
-    SERVICE_API_URL=http://127.0.0.1:7860 \
-    APP_WEB_URL=http://127.0.0.1:3000 \
     PYTHONPATH=/app/api \
     PATH="/usr/local/bin:${PATH}" \
     STORAGE_DIR=/storage \
-    # Database configuration
-    DB_USERNAME=${DB_USERNAME:-postgres} \
-    DB_PASSWORD=${DB_PASSWORD:-difyai123456} \
-    DB_HOST=${DB_HOST:-db} \
-    DB_PORT=${DB_PORT:-5432} \
-    DB_DATABASE=${DB_DATABASE:-dify} \
-    SQLALCHEMY_POOL_SIZE=${SQLALCHEMY_POOL_SIZE:-30} \
-    SQLALCHEMY_POOL_RECYCLE=${SQLALCHEMY_POOL_RECYCLE:-3600} \
-    # Redis configuration
-    REDIS_HOST=${REDIS_HOST:-redis} \
-    REDIS_PORT=${REDIS_PORT:-6379} \
-    REDIS_PASSWORD=${REDIS_PASSWORD:-difyai123456} \
-    REDIS_DB=${REDIS_DB:-0}
+    # Database configuration - match docker-compose.yaml
+    DB_USERNAME=postgres \
+    DB_PASSWORD=difyai123456 \
+    DB_HOST=db \
+    DB_PORT=5432 \
+    DB_DATABASE=dify \
+    SQLALCHEMY_POOL_SIZE=30 \
+    SQLALCHEMY_POOL_RECYCLE=3600 \
+    # Redis configuration - match docker-compose.yaml
+    REDIS_HOST=redis \
+    REDIS_PORT=6379 \
+    REDIS_PASSWORD=difyai123456 \
+    REDIS_DB=0
 
 # Copy entrypoint script
 COPY docker/entrypoint.sh /app/entrypoint.sh