fix(udf): add embedded-python-udf feature and fix dockerfile

[wangrunji0408]

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What's changed and what's your intention?

This PR makes embedded-python-udf an optional feature. This feature is not enabled by default so that developers are not required to have Python 3.12 installed. To enable it, you can run ENABLE_PYTHON_UDF=1 ./risedev d or cargo build --features embedded-python-udf. This feature is enabled in production build.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added test labels as necessary. See details.
• 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.

[fuyufjh]

LGTM

[BugenZhao]

My concern is that off-by-default features could be fragile to maintain as most of the developers won't realize its existence. 😕 Fortunately, check on CI will run with all features. I hope this can enforce the functionality and quality.

risingwave/ci/scripts/check.sh

Line 24 in 06e28e8

cargo clippy --all-targets --all-features --locked -- -D warnings

[xxchan]

release.sh is not updated, so binary release won't contain it. 😄

[xxchan]

Hmmm, but if we enable it for binary release, users without python3.12 will not be able to start RisingWave. 🤔

[wangrunji0408]

Indeed... We should make it static linked.

[BugenZhao]

Indeed... We should make it static linked.

Strong +1 for this. 🥺

---

Also I think it's okay to make it a default feature.

• It's not a big deal that developers need to install a new build-time dependency.
• If the developer is familiar with cargo and rust-analyzer, they can set --no-default-features to improve DX.
• All existing build scripts work seamlessly.