Add GitHub Actions workflows

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Use Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '22'
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run linter
+      run: npm run lint
+
+    - name: Build project
+      run: npm run build
+
+    - name: Check build artifacts
+      run: |
+        ls -la dist/
+        test -f dist/rater.js
+        test -f dist/rater.min.js

.github/workflows/deploy.yml

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+name: Deploy
+
+on:
+  push:
+    tags: [ 'v*' ]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Use Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '22'
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run linter
+      run: npm run lint
+
+    - name: Build project
+      run: npm run build
+
+    - name: Get tag message
+      if: startsWith(github.ref, 'refs/tags/')
+      id: tag_message
+      run: |
+        TAG_MESSAGE=$(git tag -l --format='%(contents)' ${{ github.ref_name }})
+        echo "tag_message<<EOF" >> $GITHUB_OUTPUT
+        echo "$TAG_MESSAGE" >> $GITHUB_OUTPUT
+        echo "EOF" >> $GITHUB_OUTPUT
+
+    - name: Create Release
+      if: startsWith(github.ref, 'refs/tags/')
+      uses: softprops/action-gh-release@v1
+      with:
+        tag_name: ${{ github.ref_name }}
+        name: Release ${{ github.ref_name }}
+        draft: false
+        prerelease: false
+        body: |
+          ${{ steps.tag_message.outputs.tag_message }}
+
+          ## Build Artifacts
+          - `dist/rater.js` - Development build (unminified)
+          - `dist/rater.min.js` - Production build (minified)
+
+          ## Installation
+          Install the userscript by copying the contents of `dist/rater.min.js` into your userscript manager.
+        files: |
+          dist/rater.js
+          dist/rater.min.js