ci: add GitHub Actions workflow to publish to npm on production merge

Author: devCluna

.github/workflows/publish.yml

@@ -0,0 +1,46 @@
+name: Publish to npm
+
+on:
+  pull_request:
+    types: [closed]
+    branches:
+      - production
+
+jobs:
+  publish:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Get package version
+        id: pkg
+        run: echo "version=$(node -p "require('./package.json').version")" >> $GITHUB_OUTPUT
+
+      - name: Publish to npm
+        run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      - name: Create GitHub release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: v${{ steps.pkg.outputs.version }}
+          name: v${{ steps.pkg.outputs.version }}
+          body: |
+            Published from PR #${{ github.event.pull_request.number }}: ${{ github.event.pull_request.title }}
+          generate_release_notes: true