Use Github actions to validate our code.

.github/workflows/configure.yml

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+name: Configure
+
+on: [push, pull_request]
+
+jobs:
+  theme-python:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v3
+      with:
+        python-version: "3.10"
+    - name: Install dependencies
+      shell: bash
+      run: |
+        python -m pip install --upgrade pip
+        pip install PySide2 PySide6 PyQt5 PyQt6
+    - name: Checking our configuration scripts.
+      run: |
+        scripts/configure.sh

.github/workflows/lint.yml

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+name: Linters
+
+on: [push, pull_request]
+
+jobs:
+  lint-version-python:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ["3.11", "3.12"]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pylint flake8 pyright
+    - name: Analysing the code with pylint
+      run: |
+        scripts/lint.sh
+
+  lint-os-python:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ["3.10"]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pylint flake8 pyright
+    - name: Analysing the code with pylint
+      run: |
+        scripts/lint.sh
+
+  lint-cpp:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]  # TODO: Restore macos-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install clang-tidy
+    - name: Analysing the code with clang-tidy
+      shell: bash
+      run: |
+        set -eux pipefail
+
+        # Windows oddly requires C++20 support due to internal bugs.
+        if [[ "${RUNNER_OS}" == "Windows" ]]; then
+          extra_args="-extra-arg=-std=c++20"
+          passthrough=""
+        elif [[ "${RUNNER_OS}" == "macOS" ]]; then
+          # NOTE: The search paths aren't added by default, and we need C then C++ by default
+          # for our search. This makes the process easier.
+          extra_args="-extra-arg=-std=c++17 -extra-arg=--stdlib=libc++"
+          location="$(xcrun --show-sdk-path)"
+          passthrough="-I${location}/usr/include/c++/v1 -I${location}/usr/include"
+        else
+          extra_args="-extra-arg=-std=c++17"
+          passthrough=""
+        fi
+        clang-tidy -checks=-*,clang-analyzer-*,-clang-analyzer-cplusplus* ${extra_args} example/breeze_theme.hpp -- ${passthrough}

.github/workflows/theme.yml

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+name: Theme
+
+on: [push, pull_request]
+
+jobs:
+  theme-python:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ["3.10"]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      shell: bash
+      run: |
+        python -m pip install --upgrade pip
+        if [[ "${RUNNER_OS}" == "Windows" ]]; then
+          python -m pip install winrt-Windows.UI.ViewManagement winrt-Windows.UI
+        fi
+    - name: Checking our Python imports.
+      run: |
+        scripts/theme.sh
+
+  theme-cpp:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]  # TODO: Restore macos-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Checking our C++ theme detection.
+      shell: bash
+      run: |
+        mkdir -p dist
+        cd dist
+        if [[ "${RUNNER_OS}" == "macOS" ]]; then
+          clang++ ../scripts/test_theme.cpp -o test_theme -std=c++17
+          ./test_theme
+        else
+          g++ ../scripts/test_theme.cpp -o test_theme -std=c++17
+          ./test_theme
+        fi
+
+  theme-cpp-windows:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: ilammy/msvc-dev-cmd@v1
+    - name: Checking our C++ theme detection.
+      run: |
+        mkdir dist -ErrorAction SilentlyContinue
+        cd dist
+        cl ..\scripts\test_theme.cpp /std:c++17 /EHsc /link Advapi32.lib OleAut32.lib
+        .\test_theme.exe

.github/workflows/ui.yml

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+name: Ui
+
+on: [workflow_dispatch]
+
+jobs:
+  ui:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v3
+      with:
+        python-version: "3.10"
+    - name: Install dependencies
+      shell: bash
+      run: |
+        python -m pip install --upgrade pip
+        pip install PySide2 PySide6 PyQt5 PyQt6
+        sudo apt-get update
+        sudo apt-get install xvfb
+        sudo apt-get install build-essential libgl1-mesa-dev libgstreamer-gl1.0-0 libpulse-dev \
+            libxcb-glx0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 \
+            libxcb-render0 libxcb-shape0 libxcb-shm0 libxcb-sync1 libxcb-util1 libxcb-xfixes0 \
+            libxcb-xinerama0 libxcb1 libxkbcommon-dev libxkbcommon-x11-0 libxcb-xkb-dev
+    - name: Checking our Python imports.
+      run: |
+        scripts/headless.sh