CI: Enable trunk jobs on PRs on main/release (pytorch#14060)

This is a temporary change to ensure stability for the main branch
before 1.0 cut. This will be reverted next week.

Author: digantdesai

.github/workflows/trunk.yml

@@ -11,6 +11,9 @@ on:
     paths:
       - .ci/docker/ci_commit_pins/pytorch.txt
       - .ci/scripts/**
+    branches:
+      - main
+      - release/*
   workflow_dispatch:
 
 concurrency: