Expose nightly and debug xbuildenvs in pyodide xbuildenv search and allow installing them via pyodide xbuildenv install

[agriyakhetarpal]

This PR adds --nightly and --debug fields based on changes made in https://github.com/pyodide/pyodide-build-environment-nightly, particularly based on the PRs I set up there (#72, #73, #74). It is a follow-up to #349.

The fields are exclusive; i.e., pyodide xbuildenv search and --all work the same as before, but including --nightly or --debug only displays them. Here is a table to summarise the changes:

Command	Information
pyodide xbuildenv search	Prints compatible stable xbuildenvs based on info in v2 spec
pyodide xbuildenv search --all	Prints both compatible and incompatible stable xbuildenvs based on info in v2 spec
pyodide xbuildenv search --debug	Prints compatible nightly-debug xbuildenvs. This can also include stable-debug xbuildenvs in the future
pyodide xbuildenv search --nightly	Prints compatible nightly-release xbuildenvs
pyodide xbuildenv search --debug --nightly	Prints compatible nightly-release and nightly-debug xbuildenvs
pyodide xbuildenv search -all --debug --nightly	Prints both compatible and incompatible nightly-release and nightly-debug xbuildenvs

Of course, the order of --all, --debug, and --nightly doesn't matter.

We can install the xbuildenvs, via --nightly and --debug flags to pyodide xbuildenv install, after finding them through the search flag.

As a result, we now have three URLs:

• Pyodide: https://pyodide.github.io/pyodide/api/v2/pyodide-cross-build-environments.json
• pyodide-build-environment-nightly:
  • release builds: https://pyodide.github.io/pyodide-build-environment-nightly/api/v2/release.json
  • debug builds: https://pyodide.github.io/pyodide-build-environment-nightly/api/v2/debug.json

The base GitHub Pages page for pyodide-build-environment-nightly is a basic HTML page with some brief information to accompany these changes: https://pyodide.github.io/pyodide-build-environment-nightly.

Additionally, I made two more changes:

• The length of the MetadataView columns is now computed dynamically based on the length of the items inside them, to prevent breaking the table due to overflows.
• For the pyodide-build version compatibility range, we now say 0.26.0 and later instead of 0.26.0 -, to be clearer about the ranges and mislead someone into thinking that the table is empty. The programmatic JSON output remains unchanged.

AI disclosure: I used Claude 4.5 Haiku to draft the tests.

Follow-ups we can do in here and Pyodide:

• Here: add the ABI version to the table, somehow, in an "ABI version" column.
• Pyodide: publish stable-debug releases as well, to complete the matrix of possible combinations, since we do nightly-debug? I reckon it'd be pretty useful.

[ryanking13]

Thanks! I am good with the overall direction, but added comments about some details.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.