fix: replace update-flake-lock to drop Node.js 20 sub-actions#3
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DeterminateSystems/update-flake-lock pulls in four sub-actions still on the Node.js 20 runtime, which GitHub forces to Node.js 24 on 2026-06-16 and removes entirely on 2026-09-16. Its latest release (v28) still pins all four, and the two leaf actions doing PR-body templating have no Node.js 24 release at all, so bumping the dependency cannot fix it. Reimplement the step inline: `nix flake update --commit-lock-file` (pure Nix, no Node) produces the lock change and its per-input changelog, which becomes the PR body; peter-evans/create-pull-request@v8 (Node.js 24) opens the PR. Only one Node action remains in the chain and it runs on Node.js 24. Also add pr-title and pr-branch inputs (defaults preserve the previous title and branch name) so the PR title / commit summary and head branch are configurable.
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What
Replace the
DeterminateSystems/update-flake-lock@v28step inupdate-flake/action.ymlwith an inline implementation:nix flake update --commit-lock-file(pure Nix, no Node) +peter-evans/create-pull-request@v8(Node.js 24).Why
update-flake-lockpulls in four sub-actions still on the Node.js 20runtime (
write-file-action,read-file-action,handlebars-action,create-pull-request@v7). GitHub forces these to Node.js 24 on 2026-06-16and removes the Node.js 20 runtime on 2026-09-16.
The latest release (v28) still pins all four, and the two leaf actions doing
PR-body templating have no Node.js 24 release at all, so bumping the
dependency cannot fix it. Reimplementing inline leaves exactly one Node action
in the chain, on Node.js 24.
Notes
--commit-lock-filechangelog becomes the PR body (replacing thetemplating chain). Behavior, inputs and outputs are preserved.
pr-title/pr-branchinputs; defaults preserve the previous titleand branch name.
update-flake/. The realacceptance test is a consumer run showing no "Node.js 20 actions are
deprecated" annotation.