ci: trigger deploy after fetch-github-stars workflow succeeds

Adds a workflow_run trigger so the site is rebuilt whenever fresh
star data lands on master, in addition to the existing push trigger.
The build job guard ensures it only runs on direct pushes or when
the upstream workflow concluded successfully.

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/deploy-website.yml

@@ -4,6 +4,10 @@ on:
   push:
     branches:
       - master
+  workflow_run:
+    workflows: ["Fetch GitHub Stars"]
+    types: [completed]
+    branches: [master]
 
 permissions:
   contents: read
@@ -16,6 +20,7 @@ concurrency:
 
 jobs:
   build:
+    if: github.event_name == 'push' || github.event.workflow_run.conclusion == 'success'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6