Update release triggers

Author: tcbegley

.github/workflows/release.yml

@@ -4,14 +4,11 @@ on:
   pull_request:
     types:
       - closed
-    branches:
-      - release/**
-      - prerelease/**
 
 jobs:
   release:
     name: Release
-    if: ${{ github.event.pull_request.merged }}
+    if: ${{ github.event.pull_request.merged }} && (startsWith(github.head_ref, 'release/') || startsWith(github.head_ref, 'prerelease/'))
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2