Add benchmarks compared to master

Signed-off-by: Pavel Abramov <[email protected]>

.github/workflows/rust.yml

@@ -19,13 +19,28 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Set safe.directory
+      run: |
+        git config --global --add safe.directory /__w/nkv/nkv
+
+
     - name: Build
       run: cargo build --verbose
     - name: Run tests
       run: cargo test --verbose
 
-    - name: Run benchmarks
-      run: cargo bench
+    - name: Checkout main branch and run benchmarks
+      run: |
+        git checkout main
+        cargo bench
+
+    - name: Checkout PR branch and run benchmarks
+      run: |
+        git checkout ${{ github.event.pull_request.head.ref }}
+        cargo bench
 
     - name: Upload benchmark results
       uses: actions/upload-artifact@v3