Attach build artifacts to GitHub releases

[stevedekorte]

Pushing a version tag now builds the WASM artifacts, runs the test suite, and attaches the results to a GitHub Release.

Until now nothing was downloadable: browser/io_browser.wasm is gitignored and none of the 12 existing tags have artifacts, so the only way to get a working Io was to clone the repo and install wasi-sdk.

What gets attached

file	what it is
io_static.wasm	The VM as a WASI 0.1 module (wasmtime, wasmer, Node)
io_component.wasm	The VM as a WASI 0.2 component (wasm32-wasip2)
io_browser.wasm	Reactor module for in-browser embedding
io-browser-<tag>.tar.gz	The browser module plus the io.js loader
SHA256SUMS.txt	Checksums

Details

• Triggers on [0-9]* and v[0-9]* tags — all 12 existing tags match the date-based scheme.
• Runs make check before publishing, so a release cannot ship a failing build.
• Tags containing alpha, beta, rc, or pre are published as prereleases.
• Can be run by hand against an existing tag to backfill artifacts onto older releases.
• Re-running against an existing release updates it instead of failing.
• Reuses the same wasi-sdk 24 and wasmtime v27 setup as ci.yml, and uses the gh CLI so no third-party actions are added.
• Release notes come from the commit log, capped at 40 entries with the remainder noted and a compare link. The curated summary stays hand-written on the Release Notes page.

Testing

Built all three targets locally and ran the staging and notes steps verbatim from the YAML. io_static.wasm and io_component.wasm both execute under wasmtime, the tarball contains the expected files, and the checksum file correctly excludes itself. All five publish paths (stable, prerelease, draft, both, and re-run) were exercised against a stubbed gh.

Note

The WASI 0.2 component step is continue-on-error, so a break there degrades the release to a warning rather than blocking the other artifacts. It is the least-exercised target because ci.yml does not build it. Adding make component to CI would be the cleaner fix and is left for a follow-up.

🤖 Generated with Claude Code