[#25494] Fix downstream-ci PR checkout and test reporting

Signed-off-by: danipiza <dpizarrogallego@gmail.com>

Author: Danipiza

.github/workflows/downstream-ci.yml

@@ -64,7 +64,7 @@ jobs:
         uses: eProsima/eProsima-CI/external/checkout@v0
         with:
           path: src/ddspipe
-          ref: ${{ github.head_ref || github.ref_name }}
+          ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.ref_name }}
 
       # Checkout the downstream tool that consumes DDS Pipe
       - name: Checkout downstream tool
@@ -115,6 +115,6 @@ jobs:
         with:
           name: "Downstream: ${{ matrix.tool.name }} | ${{ matrix.os }} | ${{ matrix.cmake_build_type }}"
           path: "${{ steps.compile_and_test.outputs.ctest_results_path }}*.xml"
-          working-directory: 'src'
+          working-directory: 'src/ddspipe'
           list-tests: 'failed'
           list-suites: 'failed'