tidy: Check GitHub workflow permissions

.github/workflows/ci.yml

@@ -160,7 +160,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     permissions:
-      contents: write # TODO test
+      contents: write
       pull-requests: write
     steps:
       - uses: actions/checkout@v3

.github/workflows/release.yml

@@ -1,8 +1,7 @@
 name: Release
 
 permissions:
-  # TODO: once `releases: write` is supported, use it instead.
-  contents: write
+  contents: read
 
 on:
   push:
@@ -18,6 +17,8 @@ jobs:
     if: github.repository_owner == 'taiki-e'
     runs-on: ubuntu-latest
     timeout-minutes: 60
+    permissions:
+      contents: write
     steps:
       - uses: actions/checkout@v3
         with: