fix: GitHub Actions権限とCheckout設定を修正

Author: kobayashiharuto

.github/workflows/benchmark.yml

@@ -11,21 +11,22 @@ on:
       - ".github/workflows/benchmark.yml"
 
 permissions:
+  contents: read
   issues: write
   pull-requests: write
-  contents: read
+  actions: read
 
 jobs:
   benchmark:
     runs-on: ubuntu-latest
-    permissions:
-      issues: write
-      pull-requests: write
-      contents: read
 
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
+          ref: ${{ github.head_ref || github.ref }}
 
       - name: Setup Go
         uses: actions/setup-go@v5