ci(nix): build the development shell into the Cachix cache - #47
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This was referenced Jul 30, 2026
The flake pins tools that only this project builds, so nothing public caches them: every contributor, dev container and CI job that enters the shell compiles the same derivations from scratch. Point them all at the `argo-workflows` Cachix cache instead, and keep it stocked. A composite action installs Nix and configures the cache, so the installer version and the cache name live in one place rather than in every job that will start using the shell. It pulls by default and only pushes when the caller hands it a token, which is how a fork pull request — where secrets are not available — stays read-only without having to say so. The workflow builds the shell on the two platforms people develop on. Linux runs on pull requests too, so a toolchain change is proven before it lands rather than after; macOS is left out of those because of what the runner costs, and warms the cache once the change is merged. The weekly schedule covers the case where nothing changes but the cache expires underneath us anyway. Nothing consumes the cache yet: converting CI jobs, the dev container and the release to the shell comes next. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Signed-off-by: Alan Clucas <alan@clucas.org>
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Based on PR #46
Chain of upstream PRs as of 2026-07-30
PR build(nix): one tools-only flake at the repo root #46:
nix-stack-base←tb-ufbi.1-pr1tb-ufbi.1-pr1←tb-ufbi.2-pr2Fixes #TODO
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https://claude.ai/code/session_01H871PuNyYPzjmpUhXCRXGA