fix: v1 setup on Linux musl (#432)

## Summary

- Detect Linux musl runners in the v1 action and download the Supabase
CLI `.apk` asset for CLI versions `>= 2.99.0`.
- Add the extracted `usr/bin` directory to `PATH` for `.apk` archives.
- Backport the optional `github-token` input for authenticated `latest`
release lookup, because the test matrix hit unauthenticated GitHub API
rate limits.
- Rebuild `dist/index.js` for the Node action.

## Validation

- `npm run format:check`
- `npm run lint`
- `npm test`
- `npm run package`
- Local Docker smoke test in `node:20-alpine` with
`INPUT_VERSION=2.100.1`
- setup-cli-testing workflow:
https://github.com/jgoux/setup-cli-testing/actions/runs/26165593808

The external workflow passed Alpine `2.100.1`, Alpine `latest`, and
Ubuntu/macOS/Windows with both `2.100.1` and `latest`.

.licenses/npm/@actions/exec.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/exec"
-version: 1.1.1
+version: 3.0.0
 type: npm
 summary: Actions exec lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/exec