CI: Build Python docstubs in Ubuntu 24.04 config

Author: dbaston

.github/workflows/ubuntu_24.04/Dockerfile.ci

@@ -166,6 +166,8 @@ RUN PYTHON_CMD=python3 && $PYTHON_CMD -m pip install --break-system-packages cfc
 
 RUN PYTHON_CMD=python3 && $PYTHON_CMD -m pip install --break-system-packages fsspec
 
+RUN PYTHON_CMD=python3 && $PYTHON_CMD -m pip install --break-system-packages docstub
+
 # Manually install ADBC packages from Ubuntu 22.04 as there are no 24.04 packages at time of writing.
 RUN curl -LO -fsS https://apache.jfrog.io/artifactory/arrow/ubuntu/pool/jammy/main/a/apache-arrow-adbc/libadbc-driver-manager102_14-1_amd64.deb \
     && curl -LO -fsS https://apache.jfrog.io/artifactory/arrow/ubuntu/pool/jammy/main/a/apache-arrow-adbc/libadbc-driver-manager-dev_14-1_amd64.deb \

.github/workflows/ubuntu_24.04/build.sh

@@ -17,7 +17,8 @@ cmake ${GDAL_SOURCE_DIR:=..} \
     "-DUSE_PRECOMPILED_HEADERS=ON" \
     -DOracle_ROOT=/opt/instantclient_19_9 \
     -DGDAL_USE_GEOTIFF_INTERNAL:BOOL=ON \
-    -DGDAL_USE_TIFF_INTERNAL:BOOL=ON
+    -DGDAL_USE_TIFF_INTERNAL:BOOL=ON \
+    -DBUILD_PYTHON_STUBS=ON 
 
 echo "Test turning GDAL drivers off"
 cp CMakeCache.txt CMakeCache.txt.bak