Merge branch 'per-15306/ci-pin-actions-tests-on-pr' into per-15315/vitest-event-based-tests

* per-15306/ci-pin-actions-tests-on-pr:
  ci: run on all pull requests, not only those targeting main

Author: zeevmoney

.github/workflows/ci.yaml

@@ -3,8 +3,8 @@ name: CI
 on:
   push:
     branches: [ main ]
+  # Run on every PR regardless of base branch so stacked PRs get CI too.
   pull_request:
-    branches: [ main ]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}