feat: Automatically create default admin account during Docker build process

DOCKER_GIT_DEPLOYMENT.md

@@ -132,13 +132,39 @@ When `GIT_REPO_URL` is provided:
 2. If `GIT_COMMIT` is specified, checkout that specific commit
 3. Install dependencies from the repository's package.json
 4. Build the application
-5. Start the production server
+5. **Create the default admin account automatically**
+6. Start the production server
 
 When `GIT_REPO_URL` is not provided:
 1. Copy local files into the container
 2. Install dependencies
 3. Build the application
-4. Start the production server
+4. **Create the default admin account automatically**
+5. Start the production server
+
+## Default Admin Account
+
+The Docker build process automatically creates a default admin account with these credentials:
+
+- **Email**: `admin@localhost.com`
+- **Password**: `admin123456`
+- **Role**: `admin`
+
+⚠️ **Important Security Note**: Please change the default password immediately after your first login!
+
+### Manual Admin Account Creation
+
+If you need to create the admin account manually (for development or testing):
+
+```bash
+# Using npm script
+npm run create-admin
+
+# Or directly
+node scripts/create-admin.js
+```
+
+The script will skip creation if an admin account already exists.
 
 ## Environment Variables
 
@@ -163,3 +189,9 @@ When `GIT_REPO_URL` is not provided:
 ### Permission Issues
 - Ensure the Docker daemon has network access
 - For private repositories, verify authentication tokens/keys
+
+### Admin Account Issues
+- If admin creation fails during build, check database initialization
+- Ensure the database file is writable in the container
+- If admin already exists, the script will skip creation (this is normal)
+- To recreate admin account, delete the database and rebuild the container