chore: add publish workflow

Author: d-koppenhagen

.github/workflows/publish.yml

@@ -0,0 +1,29 @@
+name: Publish to NPM
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+          registry-url: 'https://registry.npmjs.org'
+          
+      - name: Install dependencies
+        run: npm ci
+        
+      - name: Build
+        run: npm run build
+        
+      - name: Publish to NPM
+        run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

README.md

@@ -21,3 +21,28 @@ After installing the package, you can import the SCSS stylesheet in your project
 ```
 
 Make sure to include the necessary build tools to compile SCSS into CSS.
+
+## Publishing
+
+This package is automatically published to NPM when a new version tag is pushed to GitHub.
+
+### Release Process
+
+1. Update the version in `package.json`:
+   ```sh
+   npm version patch  # or minor/major
+   ```
+
+2. Push the tag to GitHub:
+   ```sh
+   git push origin --tags
+   ```
+
+3. The GitHub Action will automatically:
+   - Build the package
+   - Publish to NPM under `@angular-buch/styles`
+
+### Prerequisites
+
+- NPM_TOKEN secret must be configured in GitHub repository settings
+- Token must have publish permissions for the `@angular-buch` organization