chore: change checkout ref (#1213)

.github/workflows/upload_artifacts_workflow.yml

@@ -9,21 +9,26 @@ jobs:
   native-blockifier-artifacts-push:
     runs-on: starkware-ubuntu-20-04-medium
     steps:
+      - name: Get commit hash prefix for PR update
+        env:
+          COMMIT_SHA: ${{ github.event.workflow_run.head_commit.id }}
+        run: |
+          echo "SHORT_HASH=${COMMIT_SHA:0:7}" >> $GITHUB_ENV
+          echo "COMMIT_SHA=${COMMIT_SHA}" >> $GITHUB_ENV
+
       - name: Check tests status
         if: ${{ github.event.workflow_run.conclusion == 'failure' }}
         run: |
           echo 'Blockifier-CI workflow failed'
           exit 1
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ env.COMMIT_SHA }}
       - uses: ./.github/actions/bootstrap
       - name: Build native blockifier
         run: ./build_native_in_docker.sh scripts/build_native_blockifier.sh
 
         # Commit hash on pull request event would be the head commit of the branch.
-      - name: Get commit hash prefix for PR update
-        env:
-          COMMIT_SHA: ${{ github.event.workflow_run.head_commit.id }}
-        run: echo "SHORT_HASH=${COMMIT_SHA:0:7}" >> $GITHUB_ENV
 
       # TODO: Add post merge event to get the commit hash.