ci: adding yamllint action

New yamllint workflow to verify the test-spec.yml is valid

Signed-off-by: Sebastian Wezel <[email protected]>

Author: DatGizmo

.github/workflows/lint-yaml.yml

@@ -0,0 +1,34 @@
+---
+name: Lint yaml files
+
+on:
+  pull_request:
+    paths:
+      - '.github/test-spec.yml'
+
+jobs:
+  lint_yml:
+    runs-on: ubuntu-latest
+    name: Execute yamllint
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4
+      - name: yaml-lint
+        uses: ibiqlik/action-yamllint@2576378a8e339169678f9939646ee3ee325e845c  # v3.1.1
+        with:
+          file_or_dir: .github/test-spec.yml
+          strict: false  # Don't fail for warnings
+          config_data: |
+              extends: default
+              ignore: |
+                *.md
+                CODEOWNERS
+                *.ini
+              # Ignoring most of the fromat related rules.
+              rules:
+                colons: disable
+                comments: disable
+                comments-indentation: disable
+                document-start: disable
+                line-length: disable
+                new-line-at-end-of-file: disable
+                indentation: disable

.github/workflows/twister-clang.yml

@@ -0,0 +1,74 @@
+# Copyright (c) 2025, Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+name: Twister Unity Tests
+
+on:
+  pull_request:
+    types: [push, opened, reopened, synchronize]
+
+  workflow_dispatch:
+
+jobs:
+  twister_job:
+    name: Run Twister patch series (PR)
+    runs-on:
+      - runs-on=${{ github.run_id }}
+      - runner=4cpu-linux-x64
+    # Keep aligned with target NCS version
+    container: ghcr.io/nrfconnect/sdk-nrf-toolchain:v2.9.1
+    defaults:
+      run:
+        # Bash shell is needed to set toolchain related environment variables in docker container
+        # It is a workaround for GitHub Actions limitation https://github.com/actions/runner/issues/1964
+        shell: bash
+
+    steps:
+    - name: Checkout the code
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      with:
+        path: nrf-lite
+        fetch-depth: 0
+
+    - name: restore-cache-sdk
+      id: cache-sdk
+      uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4
+      with:
+        path: |
+          nrf
+          zephyr
+          modules
+        key: ${{ runner.os }}-nrf-sdk
+
+    - name: Prepare west project
+      run: |
+        west init -l nrf-lite
+        west update -o=--depth=1 -n
+
+    - name: Install requirements
+      run: |
+        apt-get update
+        apt-get install -y build-essential ninja-build gcc-multilib g++-multilib ruby
+
+    - name: Run Twister
+      working-directory: nrf-lite
+      run: |
+        west twister -vc -p native_sim -T tests --enable-asan --enable-lsan --enable-ubsan
+
+    - name: upload-logs
+      uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+      if: ${{ !cancelled() }}
+      with:
+        name: twister-logs
+        path: nrf-lite/twister-out/**/*.log
+        retention-days: 5
+
+    - name: save-cache-sdk
+      if: always() && steps.cache-sdk.outputs.cache-hit != 'true'
+      uses: actions/cache/save@5a3ec84eff668545956fd18022155c47e93e2684 # v4
+      with:
+        path: |
+          nrf
+          zephyr
+          modules
+        key: ${{ steps.cache-sdk.outputs.cache-primary-key }}