From 00f6ea3d88d40ebaf04ff3fcc99eab9fa155ec09 Mon Sep 17 00:00:00 2001
From: Simba Zhang <solderzzc@gmail.com>
Date: Fri, 6 Mar 2026 14:07:08 -0800
Subject: [PATCH] =?UTF-8?q?ci:=20add=20PR=20target=20check=20workflow=20?=
 =?UTF-8?q?=E2=80=94=20enforce=20develop-only=20PRs=20to=20master?=
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---
 .github/workflows/pr-target-check.yml | 29 +++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 .github/workflows/pr-target-check.yml

diff --git a/.github/workflows/pr-target-check.yml b/.github/workflows/pr-target-check.yml
new file mode 100644
index 00000000..cb7ee50f
--- /dev/null
+++ b/.github/workflows/pr-target-check.yml
@@ -0,0 +1,29 @@
+name: PR Target Check
+
+on:
+  pull_request:
+    types: [opened, reopened, edited, synchronize]
+
+jobs:
+  check-target:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Enforce branch strategy
+        run: |
+          BASE="${{ github.event.pull_request.base.ref }}"
+          HEAD="${{ github.event.pull_request.head.ref }}"
+
+          echo "PR: $HEAD → $BASE"
+
+          if [ "$BASE" = "master" ] && [ "$HEAD" != "develop" ]; then
+            echo "❌ Only the 'develop' branch can open PRs to 'master'."
+            echo "   Please target 'develop' instead."
+            exit 1
+          fi
+
+          if [ "$BASE" = "develop" ] && [ "$HEAD" = "master" ]; then
+            echo "❌ Do not merge 'master' back into 'develop'."
+            exit 1
+          fi
+
+          echo "✅ PR target is valid: $HEAD → $BASE"