workflows: Add compliance workflow

Add initial compliance workflow.

Signed-off-by: Johan Hedberg <johan.hedberg@silabs.com>

Author: jhedberg

.github/workflows/compliance.yml

@@ -0,0 +1,70 @@
+name: Compliance
+
+on:
+  pull_request:
+    types:
+    - edited
+    - opened
+    - reopened
+    - synchronize
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        path: zephyr-silabs
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: 3.11
+
+    - name: Setup Zephyr project
+      uses: zephyrproject-rtos/action-zephyr-setup@v1
+      with:
+        app-path: zephyr-silabs
+        toolchains: arm-zephyr-eabi
+
+    - name: Run Compliance Tests
+      continue-on-error: true
+      id: compliance
+      working-directory: zephyr-silabs
+      run: |
+        export ZEPHYR_BASE="$(dirname "$(pwd)")/zephyr"
+        git remote update origin
+        $ZEPHYR_BASE/scripts/ci/check_compliance.py --annotate -e Kconfig -e KconfigBasic -c origin/${GITHUB_BASE_REF}..origin/${GITHUB_HEAD_REF}
+
+    - name: upload-results
+      uses: actions/upload-artifact@v3
+      continue-on-error: true
+      with:
+        name: compliance.xml
+        path: zephyr-silabs/compliance.xml
+
+    - name: check-warns
+      working-directory: zephyr-silabs
+      run: |
+        export ZEPHYR_BASE="$(dirname "$(pwd)")/zephyr"
+        if [[ ! -s "compliance.xml" ]]; then
+          exit 1;
+        fi
+
+        files=($($ZEPHYR_BASE/scripts/ci/check_compliance.py -l))
+        for file in "${files[@]}"; do
+          f="${file}.txt"
+          if [[ -s $f ]]; then
+            errors=$(cat $f)
+            errors="${errors//'%'/'%25'}"
+            errors="${errors//$'\n'/'%0A'}"
+            errors="${errors//$'\r'/'%0D'}"
+            echo "::error file=${f}::$errors"
+            exit=1
+          fi
+        done
+
+        if [ "${exit}" == "1" ]; then
+          exit 1;
+        fi