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Slim down compute-node images:
- Optimize compute_ctl build for size, not performance & debug-ability
- Don't run unused stages. Saves time in not building the PLV8 extension.
- Do not include static libraries in clean postgres
- Do the installation and finishing touches in the final layer in one job
This allows docker (and kaniko) to only register one change to the files,
removing potentially duplicate changed files.
- The runtime library for libreadline-dev is libreadline8, changing the dependency saves 45 MB
- libprotobuf-c-dev -> libprotobuf-c1, saving 100 kB
- libossp-uuid-dev -> libossp-uuid16, saving 150 kB
- gdal-bin + libgdal-dev -> libgeos-c1v5 + libgdal28 + libproj19, saving 747MB
- binutils @ testing -> libc6 @ testing, saving 32 MB