ci: wire portability workflow to run on the PR

- Point at @drop-ossia-sdk-dep to pick up the fixed avnd-portability.yml
  (real SDK-free build instead of placeholder flags).
- Add migrate-avnd-addon to the push trigger so the workflow actually runs
  while in review (GitHub doesn't fire pull_request for a workflow added in
  the same PR). Drop both feature-branch refs once ossia/actions#9 lands.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jcelerier

.github/workflows/portability.yml

@@ -3,15 +3,18 @@ name: Portability
 on:
   pull_request:
   push:
-    branches: [main, master]
+    # migrate-avnd-addon is the in-review branch; drop it once this lands on main.
+    branches: [main, master, migrate-avnd-addon]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
 jobs:
   smoke:
-    uses: ossia/actions/.github/workflows/avnd-portability.yml@master
+    # Pinned to the feature branch while it's in review. Switch to @master once
+    # ossia/actions PR (drop-ossia-sdk-dep) lands.
+    uses: ossia/actions/.github/workflows/avnd-portability.yml@drop-ossia-sdk-dep
     secrets: inherit
     # All 11 lanes default ON. Override here if specific platforms are
     # known not to be relevant for this template: