ci: add release workflow

.github/workflows/release.yml

@@ -0,0 +1,49 @@
+name: npm-publish
+
+on:
+  pull_request:
+    types: [closed]
+    branches:
+      - master
+  workflow_dispatch: {}
+
+jobs:
+  publish:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write # for npm provenance
+    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'
+          cache: 'pnpm'
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build
+        run: |
+          pnpm run --if-present release:build || pnpm run --if-present build
+
+      - name: Test
+        run: pnpm run --if-present test
+
+      - name: Publish with Changesets (pnpm)
+        run: pnpm run changeset:publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+          NPM_CONFIG_PROVENANCE: true
+
+