add different py versions back

Author: cccclai

.github/workflows/pull.yml

@@ -21,6 +21,8 @@ jobs:
       contents: read
     strategy:
       fail-fast: false
+      matrix:
+        python-version: [ "3.10", "3.11", "3.12" ]
     with:
       runner: linux.2xlarge
       docker-image: ci-image:executorch-ubuntu-22.04-qnn-sdk
@@ -32,6 +34,10 @@ jobs:
         CONDA_ENV=$(conda env list --json | jq -r ".envs | .[-1]")
         conda activate "${CONDA_ENV}"
 
+        # Create a clean env for each python version
+        conda create -y -n test_env_${{ matrix.python-version }} python=${{ matrix.python-version }}
+        conda activate test_env_${{ matrix.python-version }}
+
         PYTHON_EXECUTABLE=python bash .ci/scripts/test_wheel_package_qnn.sh
 
   # test-setup-linux-gcc: