Merge pull request #1314 from github/add-ref-for-checkout-action

Add the missing ref to the checkout action for the build job

.github/workflows/integration-tests.yml

@@ -16,6 +16,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
+      with:
+        ref: 'refs/pull/${{ github.event.inputs.pr_number }}/merge'
+        fetch-depth: 0
 
     - name: Setup .NET
       uses: actions/setup-dotnet@v2