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Create a separate stage for downloading the Rust toolchain for pgrx, so that it can be cached independently of the pg-build layer. Before this, the 'pg-build-nonroot=with-cargo' layer was unnecessarily rebuilt every time there was a change in PostgreSQL sources. Furthermore, this allows using the same cached layer for building the compute images of all Postgres versions.
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.