Fix benchmark workflow permissions

- Add proper permissions for contents, pages, and id-token
- Remove manual gh-pages setup (benchmark-action handles this automatically)
- Simplify workflow by letting benchmark-action manage the gh-pages branch

Author: testingapisname

.github/workflows/benchmark.yml

@@ -12,6 +12,11 @@ on:
     - cron: '0 2 * * 0'
   workflow_dispatch:
 
+permissions:
+  contents: write
+  pages: write
+  id-token: write
+
 jobs:
   benchmark:
     name: Performance Benchmark
@@ -63,29 +68,6 @@ jobs:
           echo "=== GitHub Actions format ==="
           head -20 benchmark-results-gh.json
       
-      - name: Setup gh-pages branch if needed
-        run: |
-          git config --global user.name 'github-action-benchmark'
-          git config --global user.email 'github@users.noreply.github.com'
-          
-          # Check if gh-pages exists remotely
-          if ! git ls-remote --exit-code --heads origin gh-pages > /dev/null 2>&1; then
-            echo "Creating gh-pages branch..."
-            git checkout --orphan gh-pages
-            git rm -rf .
-            echo "# HSM Performance Benchmarks" > README.md
-            echo "" >> README.md
-            echo "Automated benchmark results for rust-hsm PKCS#11 operations." >> README.md
-            echo "" >> README.md
-            echo "Generated by [github-action-benchmark](https://github.com/benchmark-action/github-action-benchmark)." >> README.md
-            git add README.md
-            git commit -m "Initialize gh-pages branch for benchmarks"
-            git push origin gh-pages
-            git checkout main
-            echo "✓ Created gh-pages branch"
-          else
-            echo "✓ gh-pages branch already exists"
-          fi
 
       - name: Store benchmark result
         uses: benchmark-action/github-action-benchmark@v1