Add bencher GHA

.github/workflows/bencher.yml

@@ -0,0 +1,21 @@
+on:
+    push:
+      branches: bencher_experiment
+
+jobs:
+    benchmark_base_branch:
+      name: Continuous Benchmarking with Bencher
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v4
+        - uses: bencherdev/bencher@main
+        - name: Track base branch benchmarks with Bencher
+          run: |
+            bencher run \
+            --project ccf \
+            --token '${{ secrets.BENCHER_API_TOKEN }}' \
+            --branch main \
+            --testbed ubuntu-latest \
+            --adapter json \
+            --err \
+            bencher mock