[Bug] Docker builds broken by grass-gdal

[wenzeslaus]

Describe the bug

Docker builds on main fail for Ubuntu and Alpine with:

Error: buildx failed with: ERROR: failed to solve: process "/bin/bash -c git clone https://github.com/OSGeo/gdal-grass     && cd \"gdal-grass\"     && ./configure       --with-gdal=/usr/bin/gdal-config       --with-grass=/usr/local/grass85     && make -j $NUMTHREADS     && make install -j $NUMTHREADS     && cd /src     && rm -rf \"gdal-grass\"" did not complete successfully: exit code: 127

  > [build 7/7] RUN git clone https://github.com/OSGeo/gdal-grass     && cd "gdal-grass"     && ./configure       --with-gdal=/usr/bin/gdal-config       --with-grass=/usr/local/grass85     && make -j 4     && make install -j 4     && cd /src     && rm -rf "gdal-grass":
0.146 Cloning into 'gdal-grass'...
0.365 /bin/bash: line 1: ./configure: No such file or directory

Additional context

I initially thought Docker failures were caused by #5048 because that was changing our build, but Docker actually passed for the respective commit on main which I missed initially just like the fact that we are building grass-gdal there.

[wenzeslaus]

This is fixed now.