Homebrew cask: generated tap warning — switch hooks.post.install to install_steps once GoReleaser ships it

Start with .goreleaser.yaml and the hooks.post.install configuration, then check whether the GoReleaser structured install_steps support has shipped. Update the hook when available and inspect the generated Casks/lstk.rb output. Done means the generated cask no longer emits the deprecated postflight warning and passes brew style.

Every brew operation that reads localstack/tap/lstk currently prints a deprecation warning to end users:

Warning: Calling `postflight` is deprecated! Use `postflight_steps` instead.
Please report this issue to the localstack/homebrew-tap tap ...
  Casks/lstk.rb:39

Root cause

.goreleaser.yaml configures the tap release via raw-Ruby hook:

hooks:
  post:
    install: |
      if OS.mac?
        system_command "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "#{staged_path}/lstk"]
      end

GoReleaser passes this body through verbatim into the now-deprecated cask postflight stanza.

Suggested fix

Homebrew deprecated the raw-Ruby preflight/postflight blocks in favor of structured *_steps stanzas (Homebrew/brew#23366). GoReleaser support for the structured DSL is already up as goreleaser/goreleaser#6873 (all checks green at the time of writing). Once that ships, the config can become:

hooks:
  post:
    install_steps: |
      on_macos do
        run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{ .StagedPath }}/lstk"]
      end

(Note: raw #{staged_path} interpolation is not available in the new DSL; GoReleaser #6873 adds {{ .StagedPath }} for exactly this.)

Interim state

The generated cask has been patched manually in the interim: localstack/homebrew-tap#8 \u2014 verified via brew style and a real install on macOS arm64. Note that the next lstk release regenerates the cask and would reintroduce the legacy stanza until this config lands.