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)

docker/entrypoint.sh

@@ -3,27 +3,32 @@ set -e
 
 echo "Starting Dify services..."
 
-# Enhanced database connection check
+# Enhanced database connection check with timeout
 check_postgres() {
-    echo "Checking PostgreSQL connection to ${DB_HOST}:${DB_PORT}..."
-    pg_isready \
-        -h "${DB_HOST}" \
-        -p "${DB_PORT}" \
-        -U "${DB_USERNAME}" \
-        -d "${DB_DATABASE}"
+    local max_attempts=30
+    local attempt=1
+    
+    while [ $attempt -le $max_attempts ]; do
+        echo "Checking PostgreSQL connection to ${DB_HOST}:${DB_PORT} (attempt $attempt/$max_attempts)..."
+        if pg_isready -h "${DB_HOST}" -p "${DB_PORT}" -U "${DB_USERNAME}" -d "${DB_DATABASE}"; then
+            return 0
+        fi
+        attempt=$((attempt + 1))
+        sleep 5
+    done
+    return 1
 }
 
+# Try to connect with timeout
+if ! check_postgres; then
+    echo "Failed to connect to PostgreSQL after multiple attempts. Exiting."
+    exit 1
+fi
+
 check_redis() {
     redis-cli -h "${REDIS_HOST}" -p "${REDIS_PORT}" -a "${REDIS_PASSWORD}" ping > /dev/null 2>&1
 }
 
-echo "Waiting for PostgreSQL to be ready..."
-until check_postgres; do
-    echo "PostgreSQL is unavailable (host: ${DB_HOST}, port: ${DB_PORT}) - retrying..."
-    sleep 5
-done
-echo "PostgreSQL is ready!"
-
 echo "Waiting for Redis to be ready..."
 until check_redis; do
     echo "Redis is unavailable (host: ${REDIS_HOST}, port: ${REDIS_PORT}) - retrying..."