Add explicit permissions to GitHub Actions workflows

.github/workflows/release.yml

@@ -10,6 +10,8 @@ jobs:
   build:
     name: Build and Release
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - name: Checkout code
         uses: actions/checkout@v3

.github/workflows/sync-wiki.yml

@@ -11,6 +11,8 @@ jobs:
   sync-wiki:
     name: Sync Wiki to GitHub
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - name: Checkout source code
         uses: actions/checkout@v3