An experiment

.docker/docker-qgis-build-qt6.sh

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+
+mkdir /usr/src/qgis/build
+cd /usr/src/qgis/build || exit -1
+
+CLANG_WARNINGS="-Wrange-loop-construct"
+
+cmake -GNinja \
+ -DWITH_QUICK=OFF \
+ -DWITH_3D=ON \
+ -DWITH_STAGED_PLUGINS=ON \
+ -DWITH_GRASS=OFF \
+ -DSUPPRESS_QT_WARNINGS=ON \
+ -DENABLE_MODELTEST=ON \
+ -DENABLE_PGTEST=ON \
+ -DENABLE_SAGA_TESTS=ON \
+ -DENABLE_MSSQLTEST=ON \
+ -DWITH_QSPATIALITE=OFF \
+ -DWITH_QWTPOLAR=OFF \
+ -DWITH_APIDOC=OFF \
+ -DWITH_ASTYLE=OFF \
+ -DWITH_CUSTOM_WIDGETS=ON \
+ -DWITH_DESKTOP=ON \
+ -DWITH_BINDINGS=ON \
+ -DWITH_SERVER=ON \
+ -DWITH_ORACLE=OFF \
+ -DDISABLE_DEPRECATED=ON \
+ -DCXX_EXTRA_FLAGS="${CLANG_WARNINGS}" \
+ -DCMAKE_C_COMPILER=/bin/clang \
+ -DCMAKE_CXX_COMPILER=/bin/clang++ \
+ -DADD_CLAZY_CHECKS=ON \
+ -DWERROR=TRUE \
+ ..
+
+ninja

.docker/qgis3-qt6-build-deps.dockerfile

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+FROM fedora:rawhide
+MAINTAINER Matthias Kuhn <matthias@opengis.ch>
+
+RUN dnf -y install \
+    bison \
+    clang \
+    clazy \
+    exiv2-devel \
+    fcgi-devel \
+    flex \
+    gdal-devel \
+    geos-devel \
+    gsl-devel \
+    libpq-devel \
+    libspatialite-devel \
+    libzip-devel \
+    libzstd-devel \
+    ninja-build \
+    proj-devel \
+    protobuf-devel \
+    protobuf-lite-devel \
+    python3-pyqt5-sip \
+    python3-qscintilla-qt5 \
+    python3-qt5-devel \
+    qca-qt5-devel \
+    qscintilla-qt5-devel \
+    qt5-qt3d-devel \
+    qt5-qtbase-devel \
+    qt5-qtlocation-devel \
+    qt5-qtserialport-devel \
+    qt5-qttools-static \
+    qt5-qtwebkit-devel \
+    qtkeychain-qt5-devel \
+    qwt-qt5-devel \
+    spatialindex-devel \
+    sqlite-devel \
+    unzip

.github/workflows/qt6.yml

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+name: Build with Qt 6
+
+on:
+  push:
+    branches:
+      - master
+      - release-**
+    paths:
+    - 'src/**'
+    - 'tests/**'
+    - 'CMakeLists.txt'
+    - '.github/workflows/**'
+    - '.ci/**'
+  pull_request:
+    branches:
+      - master
+      - release-**
+    paths:
+    - 'src/**'
+    - 'tests/**'
+    - 'CMakeLists.txt'
+    - '.github/workflows/**'
+    - '.ci/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Setup build dependencies
+        run: |
+          docker build -t qgis_build_deps -f .docker/qgis3-qt6-build-deps.dockerfile .
+      - name: Run build
+        run: |
+          docker run -v $(pwd):/usr/src/qgis qgis_build_deps /usr/src/qgis/.docker/docker-qgis-build-qt6.sh
+