tMerge remote-tracking branch 'origin/dev' into chisel-3.5-published

.github/workflows/chipyard-run-tests.yml

@@ -1,6 +1,12 @@
 name: chipyard-ci-process
 
-on: [push]
+on:
+  # run ci on pull requests targeting dev, master, main only (since the ci runs on the merge commit)
+  pull_request:
+    branches:
+      - dev
+      - master
+      - main
 
 env:
   tools-cache-version: v13