docs: Upgrade Node.js version in Dockerfile

[miso-kyoungminkim]

This PR updates the Dockerfile based on the official pnpm guide.
The base image is upgraded from Node.js 20 to Node.js 24 as Node.js 20 is nearing end of LTS.
It also adds an explicit Corepack installation to align with changes in newer Node.js versions.
These updates ensure pnpm works reliably in the container environment.

Summary by CodeRabbit

• Documentation
  • Updated Docker examples to reference Node.js 24, ensuring compatibility with the latest Node.js version in provided configurations.

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[MikeMcC399]

Node.js 20 reached end-of-life on 2026-04-30, so it definitely makes sense to update the examples to Node.js 24.

[MikeMcC399]

Corepack installation isn't necessary for Node.js 24 however, since this version still bundles Corepack.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: 046a3156-996f-417a-8a9d-1b1317a72cfc

📥 Commits

Reviewing files that changed from the base of the PR and between 2022ba0 and a704293.

📒 Files selected for processing (1)

• docs/docker.md

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📝 Walkthrough

Walkthrough

Documentation examples for three Dockerfiles are updated to use Node.js 24-slim instead of 20-slim as the base image. No other configuration or logic changes are made.

Changes

Docker Base Image Documentation Updates

Layer / File(s)	Summary
Documentation Examples docs/docker.md	Three Dockerfile examples (lines 37, 107, 147) update the base image from node:20-slim to node:24-slim.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A hop, skip, and bump from twenty to four-and-twenty,
Node's base image now fresher, with versions aplenty!
Three Dockerfiles gleam in their documented glory,
A simple, clean upgrade to the slim image story. ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change in the pull request: upgrading the Node.js version from 20 to 24 in Dockerfiles across the documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[miso-kyoungminkim]

Corepack installation isn't necessary for Node.js 24 however, since this version still bundles Corepack.

Oh, you’re right. My bad — fixed it. Thanks!