fix(build): correct release workflow checkout ref

Author: researchxxl

.github/workflows/release-app.yaml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           fetch-depth: 0
-          ref: ${{ inputs.checkoutRef }}
+          ref: ${{ github.event.inputs.tag }}
 
       - name: Ensure release branch
         run: |