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Plv8 consists of two parts: 1. the V8 engine, which is built from vendored sources, and 2. the PostgreSQL extension. Split those into two separate steps in the Dockerfile. The first step doesn't need any PostgreSQL sources or any other files from the neon repository, just the build tools and the upstream plv8 sources. Use the build-deps image as the base for that step, so that the layer can be cached and doesn't need to be rebuilt every time. This is worthwhile because the V8 build takes a very long time.
This directory contains files that are needed to build the compute images, or included in the compute images.
compute-node.Dockerfile To build the compute image
vm-image-spec.yaml Instructions for vm-builder, to turn the compute-node image into corresponding vm-compute-node image.
etc/ Configuration files included in /etc in the compute image
patches/ Some extensions need to be patched to work with Neon. This directory contains such patches. They are applied to the extension sources in compute-node.Dockerfile
In addition to these, postgres itself, the neon postgres extension, and compute_ctl are built and copied into the compute image by compute-node.Dockerfile.