docs: update quick start to RustFS and working package downloads

[thweetkomputer]

The quick start still uses MinIO after CI switched to RustFS, and its 0.2.7 package download URLs return 404. Update the examples to use available nightly packages and a pinned RustFS 1.0.0 Docker container, with architecture detection for the cloud package, localhost-only S3 access, and explicit credentials that override the shipped placeholders.

Add Docker installation and permission guidance, retry connection resets while RustFS starts, and switch to the package directory before running the client in a new terminal.

Validation:

• On Ubuntu 24.04 ARM64 with Docker Engine 29.8.2, ran the README container commands against a fresh named volume, started the nightly RocksDBCloud package, and verified the documented insert/query returned {k: 1}.
• Also verified the same application flow with the RustFS 1.0.0 native binary.
• Shell syntax checks and git diff --check passed.

Summary by CodeRabbit

• Documentation
  • Updated the RocksDB quick start to use the nightly release.
  • Revised RocksDBCloud setup instructions to select the appropriate package for x86_64 and aarch64 systems, with unsupported architectures exiting.
  • Replaced the manual MinIO setup steps with a RustFS Docker container, including a readiness check and local-test credentials.
  • Updated the server command to pass credentials explicitly and the client instructions to run from the package directory.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between eda6a6e and b7caf1c.

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• README.md

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Walkthrough

The README quick start now uses nightly RocksDB packages and selects RocksDBCloud packages by host architecture. It replaces the MinIO setup with RustFS Docker instructions, a readiness check, explicit credentials, and an updated client command.

Changes

RocksDB quick start

Layer / File(s)	Summary
Package release and architecture README.md	The RocksDB examples use the nightly release. The RocksDBCloud instructions select amd64 or arm64 based on the host architecture and exit for unsupported architectures.
RustFS setup and client commands README.md	The RocksDBCloud instructions run RustFS in Docker and check its readiness. They provide local-test credentials, pass them to the server, and change to the package directory before running the client.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Suggested reviewers: zhangh43

Merge Risk: ⚪ Minimal · up to b7caf

The updated quick start has no evidenced merge-blocking issue. The reported Ubuntu ARM64 setup and insert/query validation support readiness to merge.

🚥 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 summarizes the README quick-start updates to RustFS and working package downloads.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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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_{A rabbit reads the nightly guide
RustFS waits, then opens wide
Two architectures find their way
Credentials help the server play
The client hops in to start the day}

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