ci: fix Node.js version and eliminate duplicate build

- Add actions/setup-node@v4 with node-version 22 to setup-bun composite
  action to satisfy Astro 5+ requirement (>=22.12.0)
- Upload dist artifact from ci job and download in deploy job
  so the build runs once instead of twice
- Reduce deploy job timeout from 10 to 5 minutes

Author: dacrab

.github/actions/setup-bun/action.yml

@@ -1,8 +1,13 @@
 name: Setup Bun and install dependencies
-description: Sets up Bun, caches Bun downloads, and installs dependencies with a frozen lockfile
+description: Sets up Node.js, Bun, caches Bun downloads, and installs dependencies with a frozen lockfile
 runs:
   using: composite
   steps:
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '22'
+
     - name: Setup Bun
       uses: oven-sh/setup-bun@v2
 

.github/workflows/main.yml

@@ -23,19 +23,26 @@ jobs:
       - uses: actions/checkout@v6
       - uses: ./.github/actions/setup-bun
       - run: bun run ci
+      - uses: actions/upload-artifact@v4
+        if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+        with:
+          name: dist
+          path: dist
+          retention-days: 1
 
   deploy:
     needs: ci
     if: github.ref == 'refs/heads/main' && github.event_name == 'push'
     runs-on: ubuntu-latest
-    timeout-minutes: 10
+    timeout-minutes: 5
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
     steps:
-      - uses: actions/checkout@v6
-      - uses: ./.github/actions/setup-bun
-      - run: bun run build
+      - uses: actions/download-artifact@v4
+        with:
+          name: dist
+          path: dist
       - uses: actions/upload-pages-artifact@v4
         with:
           path: dist