chore: update GitHub Actions workflow permissions and artifact retention

- Added permissions for reading contents, actions, and writing pull requests.
- Set artifact retention period to 1 day for the preview build.

.github/workflows/build-preview.yml

@@ -8,6 +8,10 @@ jobs:
   build-preview:
     runs-on: ubuntu-latest
     name: Build Preview Site and Upload Build Artifact
+    permissions:
+      contents: read
+      actions: read
+      pull-requests: write
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -34,4 +38,5 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: preview-build
-          path: app/dist 
+          path: app/dist
+          retention-days: 1