Add copilot-setup-steps.yml for Copilot coding agent environment

.github/workflows/copilot-setup-steps.yml

@@ -0,0 +1,79 @@
+name: "Copilot Setup Steps"
+
+# Automatically run the setup steps when they are changed to allow for easy validation, and
+# allow manual testing through the repository's "Actions" tab
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+  pull_request:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+
+jobs:
+  # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
+  copilot-setup-steps:
+    runs-on: ubuntu-22.04
+
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            cmake \
+            ninja-build \
+            gperf \
+            ccache \
+            dfu-util \
+            device-tree-compiler \
+            wget \
+            python3-dev \
+            python3-pip \
+            python3-setuptools \
+            python3-tk \
+            python3-wheel \
+            xz-utils \
+            file \
+            make \
+            gcc \
+            perl \
+            libsdl2-dev \
+            libmagic1 \
+            doxygen \
+            graphviz
+
+      - name: Install west and Zephyr Python dependencies
+        run: |
+          pip3 install --user west
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: Initialize Zephyr workspace
+        run: |
+          west init -m https://github.com/zephyrproject-rtos/zephyr --mr main zephyrproject
+          cd zephyrproject
+          west update
+          west zephyr-export
+          pip3 install --user -r zephyr/scripts/requirements.txt
+
+      - name: Install Zephyr SDK
+        run: |
+          SDK_VERSION_FILE="zephyrproject/zephyr/SDK_VERSION"
+          if [ ! -f "${SDK_VERSION_FILE}" ]; then
+            echo "ERROR: SDK_VERSION file not found at ${SDK_VERSION_FILE}"
+            exit 1
+          fi
+          SDK_VERSION=$(cat "${SDK_VERSION_FILE}")
+          SDK_URL="https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v${SDK_VERSION}/zephyr-sdk-${SDK_VERSION}_linux-x86_64.tar.xz"
+          wget -q "${SDK_URL}" -O /tmp/zephyr-sdk.tar.xz
+          mkdir -p "$HOME/zephyr-sdk"
+          tar -xf /tmp/zephyr-sdk.tar.xz -C "$HOME/zephyr-sdk" --strip-components=1
+          "$HOME/zephyr-sdk/setup.sh" -t all -h -c
+          echo "ZEPHYR_SDK_INSTALL_DIR=$HOME/zephyr-sdk" >> $GITHUB_ENV
+          rm /tmp/zephyr-sdk.tar.xz