Summary

Fixes setup-cli in Alpine/Linux musl containers after the Supabase CLI v2.99+ release layout introduced a Bun/TypeScript supabase shim alongside supabase-go.

This keeps the v2 action on Bun, but makes the musl paths explicit:

• Detect Linux musl before running oven-sh/setup-bun and pass the matching bun-linux-*-musl.zip via bun-download-url.
• Use POSIX sh for composite shell steps so the action can run in minimal Alpine containers without bash.
• Detect Linux musl in the CLI installer and download the existing .apk release asset for CLI v2.99+.
• Add the extracted APK usr/bin directory to PATH.
• Keep existing tar/zip behavior for glibc Linux, macOS, and Windows.

Root Cause

oven-sh/setup-bun does not currently include libc detection in its automatic release asset selection, so Alpine containers received a glibc Bun binary. Separately, setup-cli downloaded the generic Linux .tar.gz Supabase CLI asset, whose supabase shim is glibc-linked in v2.99+; the .apk asset contains the musl-linked shim.

Testing

• bun run ci
• Manual GitHub workflow in https://github.com/jgoux/setup-cli-testing/actions/runs/2616196598653