feat: Add Docker support for the application (#3)

This commit introduces comprehensive Docker support to streamline the development and deployment process.

Key changes include:
- A `Dockerfile` that containerizes the application using the efficient `node:20-alpine` base image. It sets up the working directory, installs dependencies, and configures the application to run on container start.
- A `.dockerignore` file to exclude unnecessary files like `node_modules` and `.git` from the build context, resulting in a smaller and more secure image.
- A `docker-compose.yml` file to simplify running the application. It defines the service, manages environment variables with sensible defaults, maps ports, and configures named volumes for `sessions` and `uploads` to ensure data persistence across container restarts.
- The `README.md` has been updated with a new "Running with Docker" section, providing clear, step-by-step instructions for getting the application running with both Docker Compose (recommended) and manual Docker commands. The commands have been updated to use the modern `docker compose` syntax.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: Codegres-com

.dockerignore

@@ -0,0 +1,9 @@
+# Ignore dependencies, git, and sensitive files
+node_modules
+npm-debug.log
+.git
+.gitignore
+
+# Ignore session and upload data
+sessions/
+uploads/

Dockerfile

@@ -0,0 +1,20 @@
+# Use the official Node.js 20 Alpine image as a base
+FROM node:20-alpine
+
+# Set the working directory in the container
+WORKDIR /usr/src/app
+
+# Copy package.json and package-lock.json to the working directory
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy the rest of the application source code
+COPY . .
+
+# Expose the port the app runs on
+EXPOSE 3000
+
+# Command to run the application
+CMD [ "npm", "start" ]

README.md

@@ -51,6 +51,71 @@ npm start
 
 ---
 
+## 🐳 Running with Docker
+
+You can also run this application using Docker and Docker Compose for a more isolated and reproducible setup.
+
+### **1. Using Docker Compose (Recommended)**
+
+This is the easiest way to get started.
+
+1.  **Create an Environment File**:
+    Create a `.env` file in the root of the project. This file will be used by Docker Compose to set the environment variables inside the container.
+
+    ```
+    # .env
+
+    # The master key to protect the server
+    MASTER_API_KEY=yoursecretkey
+
+    # The port to run the server on (optional, defaults to 3000)
+    PORT=3000
+    ```
+
+2.  **Build and Run the Container**:
+    Run the following command to build the Docker image and start the container in the background:
+
+    ```bash
+    docker compose up --build -d
+    ```
+
+    The server will now be running on the port you specified (or the default, 3000).
+
+3.  **To Stop the Server**:
+    ```bash
+    docker compose down
+    ```
+
+### **2. Using Docker (Manual)**
+
+If you prefer not to use Docker Compose, you can build and run the container manually.
+
+1.  **Build the Docker Image**:
+    ```bash
+    docker build -t whatsapp-api .
+    ```
+
+2.  **Run the Docker Container**:
+    You must pass the `MASTER_API_KEY` and map the port. You also need to create and mount volumes to persist the `sessions` and `uploads` data.
+
+    ```bash
+    docker run -d \
+      -p 3000:3000 \
+      -e MASTER_API_KEY="yoursecretkey" \
+      -e PORT="3000" \
+      --name whatsapp-api-container \
+      -v whatsapp_sessions:/usr/src/app/sessions \
+      -v whatsapp_uploads:/usr/src/app/uploads \
+      whatsapp-api
+    ```
+    - `-d`: Run in detached mode.
+    - `-p`: Map port 3000 on your host to port 3000 in the container.
+    - `-e`: Set environment variables.
+    - `--name`: Assign a name to the container.
+    - `-v`: Mount named volumes to persist data.
+
+---
+
 ## 📖 API Documentation
 
 All endpoints are prefixed with `/api`.

docker-compose.yml

@@ -0,0 +1,17 @@
+services:
+  whatsapp-api:
+    build: .
+    container_name: whatsapp_api
+    restart: unless-stopped
+    ports:
+      - "${PORT:-3000}:3000"
+    environment:
+      - MASTER_API_KEY=${MASTER_API_KEY:-yoursecretkey}
+      - PORT=${PORT:-3000}
+    volumes:
+      - whatsapp_sessions:/usr/src/app/sessions
+      - whatsapp_uploads:/usr/src/app/uploads
+
+volumes:
+  whatsapp_sessions:
+  whatsapp_uploads: