Add check to prevent fixup commits from being merged

.github/workflows/check_fixup_commits.yml

@@ -0,0 +1,24 @@
+name: 'Check Fixup Commits'
+description: 'Checks for commits containing "Fixup!"'
+inputs:
+  token:
+    description: 'GitHub Token'
+    required: true
+runs:
+  using: 'composite'
+  steps:
+    - name: Set up Git
+      run: |
+        git fetch origin +refs/heads/*:refs/remotes/origin/*
+        git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"
+        git fetch --all
+
+    - name: Check for Fixup Commits in Pull Request
+      run: |
+        commits=$(git log origin/${{ github.event.pull_request.base.sha }}..origin/${{ github.event.pull_request.head.sha }} --oneline)
+        if echo "$commits" | grep -i "fixup!"; then
+          echo "::warning file=,line=,col=::There are commits containing 'Fixup!'"
+          exit 1
+        fi
+      shell: bash
+