Postgresql 12 and PostGIS 3.x on UberSpace U7

This is a short description to get PostgreSQL v12 spatially enabled on [https://uberspace.de|Uberspace's]] U7. This is partly based on the guide Alexander Bilz has on his website but with some tweaks.

When following the Uberspace lab/manual for installing PostgreSQL, your installation is going to live in $HOME/opt/postgresql, I will therefore use the $HOME/opt directory for installing the additional dependencies for PostGIS.

1. Enable Postgresql version 12 in your U7 - follow the manual and Uber Lab guide to get that going.
2. Install a recent version of CMAKE
   1. wget https://github.com/Kitware/CMake/releases/download/v3.21.0/cmake-3.21.0-linux-x86_64.sh
   2. sh cmake-3.21.0-linux-x86_64.sh && mv cmake-3.21.0-linux-x86_64 ~/bin/
3. Install GEOS
   1. ~/bin/cmake-3.21.0-linux-x86_64/bin/cmake -DCMAKE_BUILD_TYPE=Release –install-prefix=/home/glorida/opt/geos ..
   2. make && make install
4. Install PROJ
   1. wget https://download.osgeo.org/proj/proj-8.1.0.tar.gz
5. Install GDAL
   1. wget https://github.com/OSGeo/gdal/releases/download/v3.3.1/gdal-3.3.1.tar.gz
6. Install PostGIS
   1. wget https://download.osgeo.org/postgis/source/postgis-3.1.3.tar.gz