use codspeed to report benchmarks

.github/workflows/codspeed.yml

@@ -0,0 +1,32 @@
+name: codspeed-benchmarks
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+  # `workflow_dispatch` allows CodSpeed to trigger backtest
+  # performance analysis in order to generate initial data.
+  workflow_dispatch:
+
+jobs:
+  benchmarks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Setup rust toolchain, cache and cargo-codspeed binary
+        uses: moonrepo/setup-rust@v0
+        with:
+          channel: stable
+          cache-target: release
+          bins: cargo-codspeed
+
+      - name: Build the benchmark target(s)
+        run: cargo codspeed build -p biscuit-auth
+
+      - name: Run the benchmarks
+        uses: CodSpeedHQ/action@v2
+        with:
+          run: cargo codspeed run -p biscuit-auth
+          token: ${{ secrets.CODSPEED_TOKEN }}

biscuit-auth/Cargo.toml

@@ -59,6 +59,7 @@ colored-diff = "0.2.3"
 prost-build = "0.10"
 serde = { version = "1.0.130", features = ["derive"] }
 serde_json = "1.0.67"
+codspeed-bencher-compat = "2.6.0"
 
 #[build-dependencies]
 #prost-build = "0.10"

biscuit-auth/benches/token.rs

@@ -1,12 +1,9 @@
-#[macro_use]
-extern crate bencher;
-
 extern crate biscuit_auth as biscuit;
 
-use bencher::Bencher;
 use biscuit::{
     builder::*, builder_ext::BuilderExt, datalog::SymbolTable, Biscuit, KeyPair, UnverifiedBiscuit,
 };
+use codspeed_bencher_compat::{benchmark_group, benchmark_main, Bencher};
 use rand::rngs::OsRng;
 
 fn create_block_1(b: &mut Bencher) {