ci: add GitHub Actions for testing and npm publishing

Author: htex

.github/workflows/publish.yml

@@ -0,0 +1,38 @@
+name: Publish to npm
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    
+    permissions:
+      contents: read
+      id-token: write
+    
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+          registry-url: 'https://registry.npmjs.org'
+      
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+      
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+      
+      - name: Build
+        run: pnpm run build
+      
+      - name: Publish core package
+        run: pnpm publish -r --access public --no-git-checks
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/test.yml

@@ -0,0 +1,40 @@
+name: Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x]
+    
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+      
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+      
+      - name: Run linter
+        run: pnpm run lint 2>/dev/null || echo "Linter not configured"
+      
+      - name: Build
+        run: pnpm run build
+      
+      - name: Run tests
+        run: pnpm test