Add missing contents: write permission to deploy workflow (#38)

Author: roger2hk

.github/workflows/main.yml

@@ -23,6 +23,8 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-24.04
+    permissions:
+      contents: write
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
     steps: