chore: build dashboard in Dockerfile

[xxchan]

I hereby agree to the terms of the RisingWave Labs, Inc. Contributor License Agreement.

What's changed and what's your intention?

fix #8380

Also some misc improvements

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

• My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)

Documentation

• My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)

Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[codecov]

Codecov Report

Merging #12421 (ad3bc7a) into main (ed96064) will increase coverage by 0.00%.
Report is 4 commits behind head on main.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main   #12421   +/-   ##
=======================================
  Coverage   69.67%   69.68%           
=======================================
  Files        1422     1422           
  Lines      235791   235791           
=======================================
+ Hits       164294   164303    +9     
+ Misses      71497    71488    -9     

Flag	Coverage Δ
rust	69.68% <0.00%> (+<0.01%)	⬆️

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Files Changed	Coverage Δ
src/risedevtool/config/src/main.rs	0.00% <0.00%> (ø)

... and 5 files with indirect coverage changes

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[BugenZhao]

Let's wait for the docker build results.

[BugenZhao]

We may use phase to enable rewrites conditionally on development builds.

https://nextjs.org/docs/pages/api-reference/next-config-js

[xxchan]

Tested with

docker run -it --rm -p 4566:4566 -p 5691:5691  ghcr.io/risingwavelabs/risingwave:git-ad3bc7a80f115f5800824c209eaed8b72c6e908c playground