## Summary
- Adds `scripts/install.sh` : a curl-pipe-bash installer for foundryctl,
served from `signoz.io/signoz.sh` (Vercel rewrite to this repo's
`main`).
- Detects OS/arch (darwin, linux, windows shells; amd64, arm64),
resolves the latest version via the GitHub `/releases/latest` redirect
(no API rate-limit), downloads the tarball + verifies SHA-256 against
the published checksums file, installs into `$FOUNDRY_INSTALL_DIR` →
`$XDG_BIN_HOME` → `~/.local/bin`, and runs the binary as a post-install
smoke test.
- Idempotent: same-version re-runs short-circuit early;
different-version runs prompt interactively, auto-proceed when piped
(curl-pipe-bash, CI). `-y` / `FOUNDRY_ASSUME_YES` bypasses the prompt
explicitly.
- Wires `sh-fmt` and `sh-lint` jobs into `ci.yaml` (via
`signoz/primus.workflows`) so the script is enforced against shellcheck
and shfmt on every PR.
Related: SigNoz/platform-pod#2065,
https://github.com/SigNoz/foundry/issues/96,
https://github.com/SigNoz/foundry/issues/97
