feat: add kiln-benchmarks crate

.config/release-please-config.json

@@ -10,7 +10,10 @@
   "pull-request-title-pattern": "release: `${component}` v${version}",
   "pull-request-footer": "This release was generated with [Release Please](https://github.com/googleapis/release-please).",
   "packages": {
-    "crates/git-kiln": {}
+    "crates/git-kiln": {},
+    "crates/kiln-benchmarks": {
+      "publish": false
+    }
   },
   "plugins": [{ "type": "sentence-case" }, { "type": "cargo-workspace" }],
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"

.config/release-please-manifest.json

@@ -1,3 +1,4 @@
 {
-  "crates/git-kiln": "0.0.0"
+  "crates/git-kiln": "0.0.0",
+  "crates/kiln-benchmarks": "0.0.0"
 }

.github/workflows/CD.yml

@@ -45,8 +45,9 @@ jobs:
         with:
           cache: true
           toolchain: stable
-      - name: Package crates
-        run: cargo package --workspace
+      - name: Package publishable crates
+        # kiln-benchmarks has publish = false and must be excluded from packaging
+        run: cargo package --package git-kiln
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v2
         with:
@@ -57,7 +58,33 @@ jobs:
           IS_PRERELEASE: ${{ github.event.release.prerelease }}
         run: |
           if [ "$IS_PRERELEASE" = "true" ]; then
-            cargo publish --workspace --dry-run
+            cargo publish --package git-kiln --dry-run
           else
-            cargo publish --workspace --token "$CARGO_REGISTRY_TOKEN"
+            cargo publish --package git-kiln --token "$CARGO_REGISTRY_TOKEN"
           fi
+
+  benchmarks:
+    name: Benchmarks
+    needs: check-tag
+    if: needs.check-tag.outputs.should-publish == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          cache: true
+          toolchain: stable
+      - name: Install git (for git gc / pack-refs used in benchmarks)
+        run: sudo apt-get update && sudo apt-get install -y git
+      - name: Run benchmarks
+        run: |
+          cargo bench --package kiln-benchmarks -- --output-format bencher \
+            2>&1 | tee target/criterion/bench-output.txt
+      - name: Upload benchmark results
+        uses: actions/upload-artifact@v4
+        with:
+          name: benchmark-results
+          path: target/criterion/
+          retention-days: 90