Add MongoDB Atlas configuration for secure database connection

- Update Dockerfile with MongoDB environment variables
- Add .env.example template for required secrets

.env.example

@@ -0,0 +1,36 @@
+# LibreChat MongoDB Atlas Configuration
+# Copy this file to .env and fill in your actual values
+
+# MongoDB Atlas Connection
+MONGO_URI=mongodb+srv://<username>:<password>@<cluster-name>.mongodb.net/<database-name>?retryWrites=true&w=majority
+
+# Session Security
+SESSION_EXPIRY=900000
+REFRESH_TOKEN_EXPIRY=604800000
+JWT_SECRET=your-super-secure-jwt-secret-key-here
+JWT_REFRESH_SECRET=your-super-secure-jwt-refresh-secret-key-here
+
+# Application Configuration
+HOST=0.0.0.0
+PORT=3080
+NODE_ENV=production
+
+# API Keys (if using external services)
+MISTRAL_API_KEY=your-mistral-api-key-here
+OPENROUTER_KEY=your-openrouter-key-here
+
+# Security Settings
+CREDS_KEY=your-32-character-credentials-encryption-key
+CREDS_IV=your-16-character-initialization-vector
+
+# Optional: Enable search functionality
+# SEARCH=true
+# MEILI_NO_ANALYTICS=true
+# MEILI_HOST=https://your-meilisearch-instance.com
+# MEILI_HTTP_ADDR=https://your-meilisearch-instance.com
+
+# Database Configuration
+DB_NAME=librechat
+CONVERSATIONS_COLLECTION=conversations
+USERS_COLLECTION=users
+SESSIONS_COLLECTION=sessions

Dockerfile

@@ -1,11 +1,19 @@
 FROM ghcr.io/danny-avila/librechat-dev:latest
 EXPOSE 3080
 
-# Set environment variables
+# Set default environment variables
 ENV HOST=0.0.0.0
 ENV PORT=3080
 ENV SESSION_EXPIRY=900000
 ENV REFRESH_TOKEN_EXPIRY=604800000
+ENV NODE_ENV=production
+
+# MongoDB Configuration (will be overridden by Hugging Face Secrets)
+ENV MONGO_URI=""
+ENV JWT_SECRET=""
+ENV JWT_REFRESH_SECRET=""
+ENV CREDS_KEY=""
+ENV CREDS_IV=""
 
 # Uncomment the following ENV to enable search
 # Feel free to clone our meilisearch space and update the URL with your own