ci: unify preview and release into a single workflow (#7)

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: rqbazan

.github/workflows/preview.yml

@@ -4,13 +4,18 @@ on:
   push:
     branches:
       - main
+  pull_request:
+    types: [opened, synchronize, reopened, labeled]
+    branches:
+      - main
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 jobs:
   release:
+    if: ${{ github.event_name == 'push' }}
     runs-on: ubuntu-latest
     permissions:
       id-token: write
@@ -54,3 +59,26 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
           LEFTHOOK: 0
+
+  preview:
+    if: ${{ github.event_name == 'pull_request' && (startsWith(github.head_ref, 'feat') || startsWith(github.head_ref, 'fix') || contains(github.event.pull_request.labels.*.name, 'preview')) }}
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - name: ⬇️ Checkout repo
+        uses: actions/checkout@v4
+
+      - name: 🟢 Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version-file: .node-version
+
+      - name: ⌛ Setup CI
+        uses: variableland/gh-actions/actions/setup-pnpm@main
+
+      - name: 🚀 Preview release
+        uses: variableland/gh-actions/actions/preview-release@main
+        with:
+          npm_token: ${{ secrets.NPM_TOKEN }}