Add Docker matrix build workflow for cross-platform CI/CD

.github/workflows/docker-matrix-build.yml

@@ -0,0 +1,32 @@
+name: Docker Matrix Build
+
+on:
+  push:
+    # Run on all branches (no branch filter)
+  pull_request:
+    # Run on all branches (no branch filter)
+
+jobs:
+  docker-matrix-build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        config: [Debug, Release, RelWithDebInfo, MinSizeRel]
+        arch: [x86_64-linux-gnu, x86_64-w64-mingw32]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Build Docker image
+      run: |
+        docker build -t cpp-project:${{ matrix.config }}-${{ matrix.arch }} .
+
+    - name: Run build script in Docker
+      run: |
+        docker run --rm \
+          -v ${{ github.workspace }}:/workspace \
+          -w /workspace \
+          --user root \
+          cpp-project:${{ matrix.config }}-${{ matrix.arch }} \
+          ./scripts/build.sh ${{ matrix.config }} ${{ matrix.arch }}

CMakeLists.txt

@@ -27,3 +27,20 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
 add_subdirectory( ${CMAKE_SOURCE_DIR}/src )
 
+# Copy MinGW runtime DLLs for Windows builds
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows" AND BUILD_ARCH STREQUAL "x86_64-w64-mingw32")
+    # Ensure bin directory exists
+    file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+
+    # Copy runtime DLLs
+    if(EXISTS /usr/lib/gcc/x86_64-w64-mingw32/14-win32/libstdc++-6.dll)
+        file(COPY /usr/lib/gcc/x86_64-w64-mingw32/14-win32/libstdc++-6.dll
+             DESTINATION ${CMAKE_BINARY_DIR}/bin/)
+    endif()
+
+    if(EXISTS /usr/lib/gcc/x86_64-w64-mingw32/14-win32/libgcc_s_seh-1.dll)
+        file(COPY /usr/lib/gcc/x86_64-w64-mingw32/14-win32/libgcc_s_seh-1.dll
+             DESTINATION ${CMAKE_BINARY_DIR}/bin/)
+    endif()
+endif()
+

Dockerfile

@@ -0,0 +1,36 @@
+FROM debian:trixie
+
+ARG USER=user
+ENV DEBIAN_FRONTEND=noninteractive
+
+# misc tools
+RUN apt update -y && apt install -y \
+    clangd \
+    clang-format \
+    sudo \
+    locales \
+    doxygen \
+    git \
+    build-essential \
+    make \
+    pkg-config \
+    cmake \
+    ninja-build \
+    yq \
+    jq
+
+# optional cross compile to windows    
+RUN apt update -y && apt install -y \
+    gcc-mingw-w64-x86-64 \
+    g++-mingw-w64-x86-64 
+
+RUN locale-gen en_GB.UTF-8 && update-locale
+
+RUN useradd -m $USER && echo "$USER:$USER" | chpasswd && adduser $USER sudo
+RUN echo "user            ALL = (ALL) NOPASSWD: ALL" >> /etc/sudoers
+
+RUN printf "alias ll='ls -la'" >> /home/$USER/.bashrc
+
+WORKDIR /workspace
+
+CMD /bin/bash

toolchain/cmake-x86_64-w64-mingw32.cmake

@@ -20,7 +20,5 @@ set(CMAKE_SYSTEM_INCLUDE_PATH /usr/x86_64-w64-mingw32/include)
 # Ensure dbghelp is available
 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -ldbghelp")
 
-# runtime deps for mingw
-file(   COPY        /usr/lib/gcc/x86_64-w64-mingw32/14-win32/libstdc++-6.dll build-${BUILD_ARCH}/bin/libstdc++-6.dll
-                    /usr/lib/gcc/x86_64-w64-mingw32/14-win32/libgcc_s_seh-1.dll build-${BUILD_ARCH}/bin/libgcc_s_seh-1.dll
-        DESTINATION ${CMAKE_BINARY_DIR}/bin/ )
+# runtime deps for mingw - these will be copied after the build directory is created
+# The actual copying is moved to a post-build step in the main CMakeLists.txt