Add dev container with Qt and PySide6 built from source

Dockerfile

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+# Dev container with PySide6 built from source
+FROM stateoftheartio/qt6:6.7-gcc-aqt
+ARG QT_VERSION=6.7
+
+# Install python 3.11
+USER root
+RUN apt-get update \
+    && apt-get install -y software-properties-common \
+    && add-apt-repository -y ppa:deadsnakes/ppa \
+    && apt-get update \
+    && apt-get install -y \
+    libgl1-mesa-dev \
+    git \
+    p7zip \
+    libpython3-dev \
+    python3.11-dev \
+    python3.11-venv \
+    python3.11-distutils
+# clang \
+# libclang-10-dev \
+# ENV LLVM_INSTALL_DIR=/usr/lib/llvm-10
+
+# Cleanup
+RUN sudo apt-get clean && sudo rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Set up virtualenv
+USER user
+WORKDIR /home/user
+RUN mkdir -p ~/.virtualenvs \
+    && python3.11 -m venv ~/.virtualenvs/pyside6 \
+    && . ~/.virtualenvs/pyside6/bin/activate \
+    && python -m pip install -U pip setuptools
+
+# Install pre-built libclang
+RUN curl -fLo libclang.7z https://download.qt.io/development_releases/prebuilt/libclang/libclang-release_140-based-linux-Ubuntu20.04-gcc9.3-x86_64.7z \
+    && 7zr x libclang.7z \
+    && rm libclang.7z
+ENV LLVM_INSTALL_DIR=/home/user/libclang
+
+# Check out pyside6 setup repo
+RUN git clone https://code.qt.io/pyside/pyside-setup \
+    && cd /home/user/pyside-setup \
+    && QT_TAG=$(git tag | grep '^[v?]${QT_VERSION}' | tail -n 1) \
+    && echo "Selecting PySide6 $QT_TAG" \
+    && git checkout $QT_TAG
+
+# Install dependencies and build with setuptools wrapper scripts
+RUN cd /home/user/pyside-setup \
+    && . ~/.virtualenvs/pyside6/bin/activate \
+    && python -m pip install -r requirements.txt \
+    && python setup.py build --parallel=4 --ignore-git \
+    && python setup.py install --parallel=4
+
+# Alternative: Build with cmake only, without setuptools
+# BROKEN; Must be missing some cmake flags
+
+# Misc hacks
+# Why is this needed?? Otherwise fails with:
+# stdcomplex.cpp:8:1: error: function 'StdComplex::StdComplex()' defaulted on its redeclaration with an exception-specification that differs from the implicit exception-specification ''
+# sed -i /home/user/pyside-setup/sources/shiboken6/tests/libsample/stdcomplex.cpp -e 's/StdComplex::StdComplex() noexcept = default;//'
+# hiddenobject.cpp:18:29: error: use of deleted function 'HiddenObject::HiddenObject()'
+# In file included from /home/user/pyside-setup/sources/pyside6/tests/pysidetest/hiddenobject.cpp:4:
+# hiddenobject.h:16:5: note: 'HiddenObject::HiddenObject() noexcept' is implicitly deleted because its exception-specification does not match the implicit exception-specification ''
+# sed -i /home/user/pyside-setup/sources/pyside6/tests/pysidetest/hiddenobject.h -e 's/HiddenObject::HiddenObject() noexcept = default;//'
+
+# Python headers not found
+# export CPPFLAGS=-I/usr/include/python3.11
+# export CMAKE_INCLUDE_PATH=/usr/include/python3.11
+
+# Build with cmake (BROKEN)
+# RUN cmake -B /home/user/pyside-setup/build \
+#     -S /home/user/pyside-setup \
+#     -DCMAKE_INSTALL_PREFIX=/home/user/pyside-setup/dist \
+#     -DPython_EXECUTABLE=$HOME/.virtualenvs/pyside6/bin/python \
+#     && cmake --build /home/user/pyside-setup/build --parallel 2 \
+#     && cmake --install /home/user/pyside-setup/build