fix: version matching and tool cache keys for build-metadata tags

[Lauri "datafox" Heino (melodicore)]

Summary

• Cache collision fix: toSemverCacheKey now converts build-metadata tags (1.4.0+20260707 → 1.4.0-build.20260707) so the prerelease segment survives semver.clean() inside @actions/tool-cache. Previously, all 1.4.0+<anything> builds collapsed to the same 1.4.0 cache slot.
• Version comparison fix: Extracted versionMatchesTag(ver, tag) which accepts the binary's self-reported version if it is the tag with a .{commithash} suffix appended — the format elide uses. Replaces two exact-string comparisons that always failed for build-metadata tags.
• Mismatch warning fix: Non-archive installers (shell, apt, msi, pkg, rpm) were setting release.version.tag_name to the binary's own obtainVersion() output, so the post-install mismatch check was comparing a value against itself and could never fire. They now set tag_name to the requested version (options.version), and the check skips when the version is the symbolic value 'latest'.
• CI cleanup: Removed the macos-amd64 test matrix entry — Elide no longer ships a macOS AMD64 binary; only macos-arm64 is distributed.

[codecov]

Bundle Report

Changes will increase total bundle size by 223 bytes (0.01%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
setup-elide	2.23MB	223 bytes (0.01%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: setup-elide

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
index.js	223 bytes	1.46MB	0.02%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.70%. Comparing base (d2f7423) to head (9724abd).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #255      +/-   ##
==========================================
+ Coverage   86.40%   86.70%   +0.29%     
==========================================
  Files          13       13              
  Lines        1236     1256      +20     
==========================================
+ Hits         1068     1089      +21     
+ Misses        168      167       -1     

Files with missing lines	Coverage Δ
src/install-apt.ts	81.25% <100.00%> (ø)
src/install-msi.ts	90.00% <100.00%> (+0.81%)	⬆️
src/install-pkg.ts	87.87% <100.00%> (+1.21%)	⬆️
src/install-rpm.ts	80.85% <100.00%> (+1.30%)	⬆️
src/install-shell.ts	85.10% <100.00%> (ø)
src/main.ts	86.71% <100.00%> (+0.33%)	⬆️
src/releases.ts	82.14% <100.00%> (+0.47%)	⬆️

[Copilot]

Pull request overview

This PR fixes Elide version handling when tags include semver build metadata (e.g. 1.4.0+20260707), ensuring both tool-cache lookups and post-install version validation behave correctly across installers.

Changes:

• Prevents tool-cache collisions by converting build-metadata tags into semver prerelease form for cache keys (so semver.clean() doesn’t drop the distinguishing segment).
• Adds versionMatchesTag(ver, tag) to treat .{commithash}-suffixed binary versions as matching the requested tag, and uses it for both “existing binary” preservation and mismatch warnings.
• Fixes mismatch detection for non-archive installers by recording the requested tag as release.version.tag_name (and skipping mismatch checks for symbolic latest).

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/releases.ts	Adds build-metadata-aware cache key conversion to avoid tool-cache key collisions.
src/main.ts	Introduces versionMatchesTag and uses it for preservation + mismatch warning logic (incl. skipping latest).
src/install-shell.ts	Ensures tag_name reflects the requested version (not the binary’s self-reported version).
src/install-apt.ts	Ensures tag_name reflects the requested version (not the binary’s self-reported version).
src/install-msi.ts	Ensures tag_name reflects the requested version (not the binary’s self-reported version).
src/install-pkg.ts	Ensures tag_name reflects the requested version (not the binary’s self-reported version).
src/install-rpm.ts	Ensures tag_name reflects the requested version (not the binary’s self-reported version).
tests/releases.test.ts	Adds unit coverage for toSemverCacheKey, including build-metadata cases.
tests/main.test.ts	Adds unit coverage for versionMatchesTag and updates mismatch-warning test setup.
tests/install-shell.test.ts	Updates expectations so returned tag_name matches the requested version.
tests/install-rpm.test.ts	Updates expectations so returned tag_name matches the requested version.
tests/install-pkg.test.ts	Updates expectations so returned tag_name matches the requested version.
tests/install-msi.test.ts	Updates expectations so returned tag_name matches the requested version.
tests/install-apt.test.ts	Updates expectations so returned tag_name matches the requested version.

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