Update pr_validation.yml

Author: ccassise

.github/workflows/pr_validation.yml

@@ -166,4 +166,4 @@ jobs:
 
     - name: Test
       working-directory: ${{ steps.strings.outputs.build-output-dir }}
-      run: ctest --build-config ${{ matrix.build_type }}
+      run: ctest --build-config ${{ matrix.build_type }} --output-on-failure