Merge pull request casbin#251 from smrpn/original

add github actions for benchmark

.github/workflows/pull_request.yml

@@ -0,0 +1,24 @@
+on: [pull_request]
+name: Benchmarks
+jobs:
+  runBenchmark:
+    name: run benchmark
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          profile: minimal
+      - name: Cache cargo
+        uses: actions/cache@v2.1.4
+        with:
+          path: |
+            target
+            ~/.cargo/git
+            ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+      - uses: boa-dev/criterion-compare-action@move_to_actions
+        with:
+          cwd: benches