fix: checkout action pulling the wrong commit

see actions/checkout#1359

.github/workflows/e2e-test.yml

@@ -52,6 +52,8 @@ jobs:
     steps:
       - name: Check out code into the Go module directory
         uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Install tools
         run: |