ci(nix): harden Update Nix hashes against cache.nixos.org HTTP/2 flakes#209
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The Update Nix hashes run kept dying in nix-prefetch-github when a NAR
download from cache.nixos.org corrupted over HTTP/2 ("Stream error in the
HTTP/2 framing layer" -> zstd corruption), and nix gave up because it
could not fall back to building from source. Disable HTTP/2 via NIX_CONFIG
to avoid the framing bug, bump download retries, and pass --fallback to
every nix run/build so an unusable substitute builds from source instead
of failing the run.
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The Update Nix hashes workflow (added in #208) failed twice on the same transient cache error —
nix-prefetch-githubdied when a NAR download fromcache.nixos.orgcorrupted over HTTP/2:The same path (
boost-1.89.0-dev) corrupts on every retry, so re-running doesn't help.Fix
NIX_CONFIG: http2 = falseat the job level — avoids the HTTP/2 framing bug that corrupts the stream in the first place.download-attempts = 5/connect-timeout = 20— ride out transient drops.--fallbackon everynix run/nix build— if a substitute is still unusable, build it from source instead of failing the whole run (exactly what the error message recommends).No change to the hash logic. Merge this, then re-run Actions → Update Nix hashes →
2.4.0.