docs: document Docker build memory requirement

[Wenjunyun123]

Summary:

• Documents the memory needed for local Docker production builds.
• Notes that exit code 137 usually indicates an OOM kill.
• Points users to the pre-built image when local Docker memory is constrained.

Testing:

• git diff --check

Fixes #1083

AI assistance: This documentation fix was prepared with AI assistance and reviewed before submission.

Updated the Docker quick-start docs to warn that local production builds require enough Docker memory.

• Added guidance that an exit code 137 during the build usually means the process was killed for running out of memory.
• Pointed users to increase Docker memory or use the pre-built image when local resources are constrained.
• Documentation-only change; validated with git diff --check.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 93710e4f-75ed-4a7b-8a6a-ea4d4d2ef7b2

📥 Commits

Reviewing files that changed from the base of the PR and between 2588522 and ccdf91f.

📒 Files selected for processing (1)

• DOCKER.md

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📝 Walkthrough

Walkthrough

The Docker quick-start instructions now note that local builds run a full Next.js production build, may exit with code 137 when Docker memory is too low, and suggest increasing the Docker memory limit or using the pre-built image.

Changes

Docker documentation note

Layer / File(s)	Summary
Local build memory note DOCKER.md	The “To build locally” section now includes a warning about production build memory usage and exit code 137 out-of-memory failures.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• f/prompts.chat#1133: Also updates DOCKER.md with guidance about Docker memory limits and 137 exits during local or first-run builds.

🚥 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 clearly and concisely describes the main change: documenting Docker build memory requirements.
Linked Issues check	✅ Passed	The docs update matches issue #1083 by explaining exit code 137 as likely OOM and pointing users to increase Docker memory or use the pre-built image.
Out of Scope Changes check	✅ Passed	The pull request appears scoped to the documented Docker memory note and adds no unrelated code changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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