Try to fix test_model.sh (#5361)

Summary:
Trying to fix failures such as https://github.com/pytorch/executorch/actions/runs/10855583772/job/30128512970

For the time missing operator error is repro'ed on my Mac, I see cmake-out/ was not cleaned up and merged.yaml was missing linear.out because it was super old.

Now without deep understanding of how CI job workers cache previous runs, I'm refactoring `build_cmake_executor_runner` in test_model.sh to make sure it always build clean.

Pull Request resolved: #5361

Reviewed By: swolchok

Differential Revision: D62665029

Pulled By: larryliu0820

fbshipit-source-id: 9c15c6581079b544084ae53979c995bc83cc46f9

Author: larryliu0820

.ci/scripts/test_model.sh

@@ -50,24 +50,21 @@ prepare_artifacts_upload() {
 
 build_cmake_executor_runner() {
   echo "Building executor_runner"
-  (rm -rf ${CMAKE_OUTPUT_DIR} \
-    && mkdir ${CMAKE_OUTPUT_DIR} \
-    && cd ${CMAKE_OUTPUT_DIR} \
-    && retry cmake -DCMAKE_BUILD_TYPE=Release \
+  rm -rf ${CMAKE_OUTPUT_DIR}
+  cmake -DCMAKE_BUILD_TYPE=Debug \
       -DEXECUTORCH_BUILD_KERNELS_OPTIMIZED=ON \
-      -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" ..)
+      -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" \
+      -B${CMAKE_OUTPUT_DIR} .
 
-  cmake --build ${CMAKE_OUTPUT_DIR} -j4
+  cmake --build ${CMAKE_OUTPUT_DIR} -j4 --config Debug
 }
 
 run_portable_executor_runner() {
   # Run test model
   if [[ "${BUILD_TOOL}" == "buck2" ]]; then
     buck2 run //examples/portable/executor_runner:executor_runner -- --model_path "./${MODEL_NAME}.pte"
   elif [[ "${BUILD_TOOL}" == "cmake" ]]; then
-    if [[ ! -f ${CMAKE_OUTPUT_DIR}/executor_runner ]]; then
-      build_cmake_executor_runner
-    fi
+    build_cmake_executor_runner
     ./${CMAKE_OUTPUT_DIR}/executor_runner --model_path "./${MODEL_NAME}.pte"
   else
     echo "Invalid build tool ${BUILD_TOOL}. Only buck2 and cmake are supported atm"