🪵 fix: Standardize Logging Directory with Environment-Aware Resolution (#11000)

* refactor: Implement getLogDir function to set log directory based on environment variables and execution context (Docker or local)
* fix: Adjust Dockerfile to create the correct log directory path for consistency

api/config/winston.js

@@ -1,9 +1,36 @@
 const path = require('path');
+const fs = require('fs');
 const winston = require('winston');
 require('winston-daily-rotate-file');
 const { redactFormat, redactMessage, debugTraverse, jsonTruncateFormat } = require('./parsers');
 
-const logDir = path.join(__dirname, '..', 'logs');
+/**
+ * Determine the log directory.
+ * Priority:
+ * 1. LIBRECHAT_LOG_DIR environment variable (allows user override)
+ * 2. /app/logs if running in Docker (bind-mounted with correct permissions)
+ * 3. api/logs relative to this file (local development)
+ */
+const getLogDir = () => {
+  if (process.env.LIBRECHAT_LOG_DIR) {
+    return process.env.LIBRECHAT_LOG_DIR;
+  }
+
+  // Check if running in Docker container (cwd is /app)
+  if (process.cwd() === '/app') {
+    const dockerLogDir = '/app/logs';
+    // Ensure the directory exists
+    if (!fs.existsSync(dockerLogDir)) {
+      fs.mkdirSync(dockerLogDir, { recursive: true });
+    }
+    return dockerLogDir;
+  }
+
+  // Local development: use api/logs relative to this file
+  return path.join(__dirname, '..', 'logs');
+};
+
+const logDir = getLogDir();
 
 const { NODE_ENV, DEBUG_LOGGING = true, CONSOLE_JSON = false, DEBUG_CONSOLE = false } = process.env;