Try ternary to fix PR checkout

Author: BrunoQuaresma

.github/workflows/ci.yaml

@@ -53,6 +53,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
 
       - name: Echo Go Cache Paths
         id: go-cache-paths