ci: install Bun on runner before npm ci

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: klocus

.github/workflows/publish.yml

@@ -26,6 +26,9 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+
       - name: Setup Node.js and enable npm cache
         uses: actions/setup-node@v4
         with: