ci: run FreeBSD and Windows ARM64 checks on pushes to release

The release playbook runs the slow platform checks nightly and on every
push to release, so a regression shows up before a release is published.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/freebsd.yml

@@ -9,6 +9,8 @@ name: FreeBSD
 # or dependency change: a drifted dependency still shows up within a day. PRs that change the
 # FreeBSD packaging itself still run it.
 on:
+  push:
+    branches: [release]
   schedule:
     - cron: "17 2 * * *"
   pull_request:

.github/workflows/windows-arm64.yml

@@ -7,6 +7,8 @@ name: Windows ARM64
 # Nightly on main (dependency and runner-image drift shows up within a day), and on PRs that
 # change the Windows packaging itself.
 on:
+  push:
+    branches: [release]
   pull_request:
     paths:
       - .github/workflows/windows-arm64.yml