add auto release script

BUILD_RELEASE.md

@@ -0,0 +1,69 @@
+# Build and Release Instructions
+
+## Overview
+
+This project uses webpack to bundle all HTML, CSS, JavaScript, and images into a single all-in-one HTML file. The GitHub workflow automatically builds and releases this file when you create a new tag.
+
+## How to Create a Release
+
+1. Make sure all your changes are committed
+2. Create and push a new tag:
+   ```bash
+   git tag v1.0.0
+   git push origin v1.0.0
+   ```
+3. The GitHub workflow will automatically:
+   - Install dependencies
+   - Build the all-in-one HTML file using webpack
+   - Create a new release with the tag
+   - Upload the bundled HTML file to the release
+
+## Manual Build
+
+To build locally:
+
+```bash
+# Install dependencies
+npm install
+
+# Build the all-in-one HTML file
+npm run build
+```
+
+The output will be in the `dist/` directory as `index.html`.
+
+## How It Works
+
+1. **build-scripts/prepare-html.js**: Pre-build script
+   - Reads the original `index.html`
+   - Removes local CSS and JavaScript references
+   - Generates temporary `index.build.html` for webpack
+
+2. **webpack.config.js**: Configures webpack to bundle all assets
+   - Uses `style-loader` to inline CSS
+   - Uses `asset/inline` to embed images as base64
+   - Uses `html-inline-script-webpack-plugin` to inline JavaScript
+   - Uses `index.build.html` as template (generated dynamically)
+
+3. **bundle-entry.js**: Entry point that imports all resources
+   - Imports CSS files
+   - Imports JavaScript modules
+   - Imports and sets logo image
+
+4. **package.json scripts**:
+   - `prebuild`: Automatically runs before build to generate `index.build.html`
+   - `build`: Runs webpack to bundle everything
+   - `postbuild`: Cleans up temporary `index.build.html` file
+
+5. **.github/workflows/release.yml**: GitHub workflow
+   - Triggers on tag push
+   - Builds the project (prebuild → build → postbuild)
+   - Creates a release with the bundled HTML file
+
+## External Dependencies
+
+The bundled HTML file still relies on these CDN resources:
+- Font Awesome (icons)
+- Chart.js (charts and graphs)
+
+These are loaded from CDN to keep the file size reasonable and leverage browser caching.