From dfc542821ff433bdbd9c5227e1ac3d38ee21875d Mon Sep 17 00:00:00 2001
From: Preston Van Loon <pvanloon@offchainlabs.com>
Date: Tue, 27 Feb 2024 09:53:58 -0600
Subject: [PATCH] Add github action requiring a diff to changelog.md.

---
 .github/workflows/changelog.yml | 39 +++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 .github/workflows/changelog.yml

diff --git a/.github/workflows/changelog.yml b/.github/workflows/changelog.yml
new file mode 100644
index 00000000000..a5005cd46d7
--- /dev/null
+++ b/.github/workflows/changelog.yml
@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - develop
+
+jobs:
+  # ------------------------------------------------------------------------------------------------------------------------------------------------
+  # Event `pull_request`: Compare the last commit of the main branch or last remote commit of the PR branch -> to the current commit of a PR branch.
+  # ------------------------------------------------------------------------------------------------------------------------------------------------
+  changed_files:
+    runs-on: ubuntu-latest 
+    name: Check CHANGELOG.md
+    steps:
+      - uses: actions/checkout@v4
+
+      # -----------------------------------------------------------------------------------------------------------
+      # Example 1
+      # -----------------------------------------------------------------------------------------------------------
+      - name: changelog modified
+        id: changelog-modified
+        uses: tj-actions/changed-files@v42
+        with:
+          files: CHANGELOG.md
+
+      - name: List all changed files
+        env:
+          ALL_CHANGED_FILES: ${{ steps.changelog-modified.outputs.all_changed_files }}
+        run: |
+          if [[ ${ALL_CHANGED_FILES[*]} =~ (^|[[:space:]])"CHANGELOG.md"($|[[:space:]]) ]];
+          then
+            echo "CHANGELOG.md was modified.";
+            exit 0;
+          else
+            echo "CHANGELOG.md was not modified.";
+            echo $ALL_CHANGED_FILES;
+            exit 1;
+          fi