add a self test action

.github/workflows/self-test.yml

@@ -0,0 +1,58 @@
+name: Self test action
+
+on:
+  push:
+    branches: main
+    paths-ignore: "docs/**"
+  pull_request:
+    branches: main
+    paths-ignore: "docs/**"
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+        clang-version: ['9','10', '11', '12', '13', '14', '15', '16', '17', '18']
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Cache the build artifacts
+        id: cache-build
+        uses: actions/cache@v4
+        with:
+          path: build
+          key: ${{ runner.os }}-${{ hashFiles('docs/examples/demo/CMakeLists.txt', 'docs/examples/demo/demo.cpp', 'docs/examples/demo/demo.hpp') }}
+
+      - name: Generate compilation database
+          if: steps.cache-build.outputs.cache-hit != 'true'
+          run: mkdir build && cmake -Bbuild docs/examples/demo
+
+      - name: Self test action
+          uses: ./
+          id: linter
+          env:
+            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          with:
+            style: file
+            files-changed-only: false
+            # to ignore all build folder contents
+            ignore: build
+            database: build
+            verbosity: 9
+            version: ${{ matrix.clang-version }}
+            thread-comments: ${{ matrix.clang-version == '12' }}
+            file-annotations: ${{ matrix.clang-version == '12' }}
+            extra-args: -std=c++14 -Wall
+
+      - name: Fail fast?!
+        # if: steps.linter.outputs.checks-failed > 0
+        run: |
+          echo "some linter checks failed"
+          echo "${{ steps.linter.outputs.checks-failed }}"
+          echo "${{ env.checks-failed }}"
+        # for actual deployment
+        # run: exit 1

docs/examples/demo/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15)
+
+# Set the project name to your project name
+project(demo C CXX)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_executable(demo_app 
+    ${CMAKE_BINARY_SOURCE_DIR}demo.hpp
+    ${CMAKE_BINARY_SOURCE_DIR}demo.cpp
+)
+target_include_directories(demo_app PUBLIC ${CMAKE_BINARY_SOURCE_DIR})