use raw docker image

Author: cccclai

.github/workflows/pull.yml

@@ -23,7 +23,7 @@ jobs:
       fail-fast: false
     with:
       runner: linux.2xlarge
-      docker-image: ci-image:executorch-ubuntu-22.04-qnn-sdk
+      docker-image: ci-image:executorch-ubuntu-22.04-clang12
       submodules: 'recursive'
       ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
       timeout: 180