ci: save and export browser bench

.github/workflows/zig-test.yml

@@ -71,7 +71,43 @@ jobs:
         run: zig build -Dengine=v8
 
       - name: zig build test
-        run: zig build test -Dengine=v8
+        run: zig build test -Dengine=v8 -- --json > bench.json
 
       - name: zig build release
         run: zig build -Doptimize=ReleaseSafe -Dengine=v8
+
+      - name: write commit
+        run: |
+          echo "${{github.sha}}" > commit.txt
+
+      - name: upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: bench-results
+          path: |
+            bench.json
+            commit.txt
+          retention-days: 10
+
+  bench-fmt:
+    name: perf-fmt
+    needs: zig-test
+
+    # Don't execute on PR
+    if: github.event_name != 'pull_request'
+
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/lightpanda-io/perf-fmt:latest
+      credentials:
+       username: ${{ github.actor }}
+       password: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - name: download artifact
+        uses: actions/download-artifact@v3
+        with:
+          name: bench-results
+
+      - name: format and send json result
+        run: /perf-fmt bench-browser ${{ github.sha }} bench.json