Migrate cask postflight to postflight_steps once GoReleaser v2.19.0 ships #96

Context

Homebrew 7.0 deprecated the raw-Ruby postflight cask stanza in favour of a declarative postflight_steps DSL. Our generated cask still emits postflight, so brew prints a deprecation warning on every command that touches the tap. Deprecations become errors in a later Homebrew release.

This could not be fixed alongside the verified: removal because the GoReleaser side does not exist in any stable release yet: hooks.post.install_steps is milestoned for v2.19.0, which is currently unreleased (nightlies only).

• homebrew_casks: hooks emit Homebrew's deprecated postflight stanza goreleaser/goreleaser#6870 — the tracking issue
• feat(cask): add hooks install_steps, deprecate raw Ruby hooks goreleaser/goreleaser#6873 — the implementing PR

What to do when v2.19.0 ships

Bump the pinned GoReleaser in the release workflow, then change each homebrew_casks entry from:

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

to:

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

{{ .StagedPath }} is a new GoReleaser template field shipped alongside install_steps, needed because Homebrew's own {{staged_path}} token uses the same delimiters as GoReleaser templates.

Note install_steps is a fixed step vocabulary (run, mkdir_p, move, symlink, terminate_process, …), not arbitrary Ruby — it cannot be a mechanical translation of any more complex hook.

Verification

goreleaser check, then a snapshot build, and confirm the generated cask contains postflight_steps and no postflight. After a release lands, brew update && brew upgrade should print no warning for this tap.

🤖 Generated with Claude Code