Merge pull request #8189 from dotnet/backport/pr-8140-to-release/8.0.1xx

[release/8.0.1xx] Onboard new inter-branch merge flow [Workflow]

Author: v-wuzhai

.github/workflows/inter-branch-merge-flow.yml

@@ -0,0 +1,13 @@
+name: Inter-branch merge workflow
+on:
+  push:
+    branches:
+      - release/**
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  Merge:
+    uses: dotnet/arcade/.github/workflows/inter-branch-merge-base.yml@main