Installing python dependencies last

[DodgySpaniard]

Python dependencies (throug PIP) require gdal, moving python install after superbuild. Keeping Numpy (to compile opnecv).

[DodgySpaniard]

Tested on ARM build: buildx build --file portable.Dockerfile --platform linux/arm64

[spwoodcock]

Lgtm 👍

[smathermather]

Maybe an extant bug from #1995, PDAL needs GEOS support or else split merge breaks as PDAL cannot generate the hexbin-based boundary:

pdal info --boundary --filters.hexbin.edge_length=1 --filters.hexbin.threshold=1 "/datasets/code/submodels/submodel_0000/odm_georeferencing/odm_georeferenced_model
.decimated.las" > "/datasets/code/submodels/submodel_0000/odm_georeferencing/odm_georeferenced_model.boundary.json"
PDAL: PDAL must be using a version of GDAL built with GEOS support to use this function.

[WARNING] Cannot calculate crop bounds! We will skip cropping!

Otherwise, I don't see any issues.

To replicate, download Brighton Beach, then run with the following options: --split 8 --split-overlap 20.

[DodgySpaniard]

I added the dependencies geos and expat to the system. GDAL CMake uses find_package and uses them by default if found.

As a side note, it is a good gotcha using the split settings, taking notes as we need to define a test process for releases.