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The build-tools image contains various build tools and dependencies, mostly Rust-related. The compute image build used it to build compute_ctl and a few other little rust binaries that are included in the compute image. However, for extensions built in Rust (pgrx), the build used a different layer which installed the rust toolchain using rustup. Switch to using the same rust toolchain for both pgrx-based extensions and compute_ctl et al. Since we don't need anything else from the build-tools image, I switched to using the toolchain installed with rustup, and eliminated the dependency to build-tools altogether. The compute image build no longer depends on build-tools. Note: We no longer use 'mold' for linking compute_ctl et al, since mold is not included in the build-deps-with-cargo layer. We could add it there, but it doesn't seem worth it. I proposed stopping using mold altogether in https://github.com/neondatabase/neon/pull/10735, but that was rejected because 'mold' is faster for incremental builds. That doesn't matter much for docker builds however, since they're not incremental, and the compute binaries are not as large as the storage server binaries anyway.
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.