CI Tests for Zephyr Integration (#12734)

### Summary
Adding in CI tests to verify and maintain support for Zephyr projects
that build executorch as a module. The main zephyr application source
code is hosted externally for now, but the process to host an Executorch
as an official module of zephyr is in progress.

This PR runs the simple Add model as unit tests, and verifies that the
output is `2.0` (1D tensor + 1D tensor, values filled with `1.0s`). This
is intended to be a simple and fast test to exemplify how to use
executorch to build an executor_runner for other models.

### Test plan
Added a new CI test called `test-models-arm-zephyr` that exits with
status 0 on success, and 1 on failure.

Author: BujSet

.ci/docker/common/install_zephyr.sh

@@ -8,6 +8,9 @@
 
 set -ex
 
+# shellcheck source=/dev/null
+source "$(dirname "${BASH_SOURCE[0]}")/utils.sh"
+
 # Double check if the NDK version is set
 [ -n "${ZEPHYR_SDK}" ]
 
@@ -77,16 +80,8 @@ install_prerequiresites() {
         chmod +x kitware-archive.sh && \
         ./kitware-archive.sh && \
         rm -f kitware-archive.sh
-    useradd -d /home/zephyruser -m -s /bin/bash zephyruser
-}
-
-install_sdk() {
-    wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.16.0/zephyr-sdk-0.16.0_linux-x86_64.tar.xz && \
-         tar -xf zephyr-sdk-0.16.0_linux-x86_64.tar.xz && \
-         rm -f zephyr-sdk-0.16.0_linux-x86_64.tar.xz && \
-         cd zephyr-sdk-0.16.0/ && \
-         ./setup.sh -c -t arm-zephyr-eabi
+    pip_install --no-cache-dir west
+    pip_install pyelftools
 }
 
 install_prerequiresites
-install_sdk

.ci/docker/ubuntu/Dockerfile

@@ -86,8 +86,9 @@ ARG ARM_SDK
 
 ARG ZEPHYR_SDK
 COPY ./common/install_zephyr.sh install_zephyr.sh
+COPY ./common/utils.sh utils.sh
 RUN if [ -n "${ZEPHYR_SDK}" ]; then bash ./install_zephyr.sh; fi
-RUN rm install_zephyr.sh
+RUN rm install_zephyr.sh utils.sh
 
 ARG QNN_SDK
 

.ci/scripts/zephyr-utils.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+download_arm_zephyr_sdk () {
+    wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.16.0/zephyr-sdk-0.16.0_linux-x86_64.tar.xz
+    tar -xf zephyr-sdk-0.16.0_linux-x86_64.tar.xz
+    rm -f zephyr-sdk-0.16.0_linux-x86_64.tar.xz
+}
+
+setup_zephyr_et_module () {
+    git clone --branch executorch-module-integration https://github.com/BujSet/zephyr.git
+    west init -l zephyr
+    west config manifest.project-filter -- +executorch
+    west -v update
+}

.github/workflows/trunk.yml

@@ -55,6 +55,49 @@ jobs:
         # Build and test executorch
         PYTHON_EXECUTABLE=python ${CONDA_RUN} bash .ci/scripts/test_model.sh "${MODEL_NAME}" "${BUILD_TOOL}" "${BACKEND}"
 
+  test-models-arm-zephyr:
+    name: test-models-arm-zephyr
+    uses: pytorch/test-infra/.github/workflows/linux_job.yml@main
+    strategy:
+      matrix:
+        model: [add]
+      fail-fast: false
+    with:
+      runner: linux.2xlarge
+      docker-image: ci-image:executorch-ubuntu-22.04-zephyr-sdk
+      submodules: 'recursive'
+      ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
+      timeout: 120
+      script: |
+        MODEL_NAME=${{ matrix.model }}
+        CONDA_ENV=$(conda env list --json | jq -r ".envs | .[-1]")
+        conda activate "${CONDA_ENV}"
+
+        source .ci/scripts/utils.sh
+        source .ci/scripts/zephyr-utils.sh
+        mkdir -p zephyr_scratch/
+        cd zephyr_scratch
+        export ZEPHYR_PROJ_ROOT=$(realpath $(pwd))
+
+        download_arm_zephyr_sdk
+        ./zephyr-sdk-0.16.0/setup.sh -c -t arm-zephyr-eabi
+
+        cd $ZEPHYR_PROJ_ROOT
+        setup_zephyr_et_module
+
+        cd $ZEPHYR_PROJ_ROOT/modules/lib/executorch
+        install_executorch "--use-pt-pinned-commit"
+        .ci/scripts/setup-arm-baremetal-tools.sh --target-toolchain zephyr
+        source examples/arm/ethos-u-scratch/setup_path.sh
+        source $ZEPHYR_PROJ_ROOT/zephyr/zephyr-env.sh
+        cd $ZEPHYR_PROJ_ROOT/zephyr/samples/modules/executorch/arm/hello_world
+        west build -p always -b mps3/corstone300/fvp
+        FVP_Corstone_SSE-300_Ethos-U55 -a build/zephyr/zephyr.elf -C mps3_board.visualisation.disable-visualisation=1 -C mps3_board.telnetterminal0.start_telnet=0 -C mps3_board.uart0.out_file='sim.out'  -C cpu0.CFGITCMSZ=15 -C cpu0.CFGDTCMSZ=15 --simlimit 120
+
+        grep -qF "Output[0][0]: (float) 2.000000" sim.out
+        exit_status=$? #store 0 if found (success), 1 if not (failure)
+        exit $exit_status
+
   test-models-linux-aarch64:
     name: test-models-linux-aarch64
     uses: pytorch/test-infra/.github/workflows/linux_job_v2.yml@main