Update merge-train-create-pr.yml

Author: ludamad

.github/workflows/merge-train-create-pr.yml

@@ -14,16 +14,19 @@ jobs:
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+        with:
+          fetch-depth: 0
 
       - name: Check if PR exists and create if needed
         env:
           GITHUB_TOKEN: ${{ secrets.AZTEC_BOT_GITHUB_TOKEN }}
         run: |
             branch="${{ github.ref_name }}"
 
-            # Skip if this is a merge commit
-            if [[ "${{ github.event.head_commit.message }}" == "Merge "* ]]; then
-              echo "Skipping: This is a merge commit"
+            # Skip if this is a merge commit (check for multiple parents)
+            parent_count=$(git rev-list --parents -n 1 "${{ github.sha }}" | wc -w)
+            if [[ $parent_count -gt 2 ]]; then
+              echo "Skipping: This is a merge commit."
               exit 0
             fi