https://git.ruby-lang.org/ruby.git/commit/?id=edd2538268

From edd25382687c840f10eec23d72fa08ebd3515fbf Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Mon, 12 Aug 2019 23:36:42 +0900
Subject: Add a quick job to be used for branch protection


diff --git a/.github/workflows/check_branch.yml b/.github/workflows/check_branch.yml
new file mode 100644
index 0000000..797e78e
--- /dev/null
+++ b/.github/workflows/check_branch.yml
@@ -0,0 +1,15 @@ https://github.com/ruby/ruby/blob/trunk/.github/workflows/check_branch.yml#L1
+# This will be used to achieve [Misc #16094] later.
+name: check_branch
+on: [pull_request]
+jobs:
+  master:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check if branch is master
+        run: |
+          if [ "$BASE_REF" != master ]; then
+            echo "Only master branch accepts a pull request, but it's '$BASE_REF'."
+            exit 1
+          fi
+        env:
+          BASE_REF: ${{ github.base_ref }}
-- 
cgit v0.10.2


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