docker: Address build warnings in Ubuntu Dockerfile #4090
+454
−314
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There were a couple of warnings about undefined environment variables (and style) when building the ubuntu docker image.
This PR addresses those and also limits numpy to < 2.0. While GRASS GIS is compatible with NumPy 2.0, a bunch of python packages that may be used wit GRASS GIS are not, so for the time being I suggest to ship NumPy < 2...
I guess it would be possible to use ARG instead of ENV for a bunch of variables used, so less environment variables are set in the final docker image... Should that be changed?