Run benchmarks when a release is published

Author: weiji14

.github/workflows/benchmarks.yml

@@ -14,6 +14,9 @@ on:
   # `workflow_dispatch` allows CodSpeed to trigger backtest
   # performance analysis in order to generate initial data.
   workflow_dispatch:
+  release:
+    types:
+      - published
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}