Fetch the whole git history when cloning

.github/workflows/trigger-benchmarks-on-message.yml

@@ -35,6 +35,7 @@ jobs:
       - uses: actions/checkout@v3
         if: success()
         with:
+          fetch-depth: 0 # fetch full history to be able to get main commit sha
           ref: ${{ steps.comment-branch.outputs.head_ref }}
 
       # Set variables