ci(release): switch homebrew install to formula

[flc1125]

Summary

Switch the Homebrew distribution from cask install syntax to a formula-based install path for the tapd CLI.

Changes

• Replace the GoReleaser Homebrew cask publisher with a formula publisher under Formula/tapd.rb
• Install the released tapd binary through the formula bin.install stanza
• Update the README install command to brew install go-tapd/tap/tapd

Motivation

• tapd is a CLI, so formula install syntax is more natural than cask syntax
• This avoids directing CLI users through the cask flow that triggered macOS Gatekeeper warnings for downloaded binaries

Testing

• make release-check
• make release-snapshot
• go test ./...
• brew info --formula go-tapd/tap/tapd against the generated formula

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0a96d672-c7a5-4f9c-b068-5eaa54b9adac

📥 Commits

Reviewing files that changed from the base of the PR and between 7b263a4 and 929ac31.

📒 Files selected for processing (2)

• .goreleaser.yaml
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/homebrew-formula

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[Copilot]

Pull request overview

This PR updates the release and documentation flow to distribute tapd via a Homebrew formula instead of a cask, aligning installation with typical CLI conventions and avoiding Gatekeeper warnings associated with cask-downloaded binaries.

Changes:

• Switch GoReleaser from homebrew_casks to brews and publish the formula into Formula/.
• Define formula install/test stanzas (bin.install "tapd" and a basic --help test).
• Update README Homebrew install instructions to use formula install syntax.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
README.md	Updates the Homebrew install command to use formula syntax (no --cask).
.goreleaser.yaml	Replaces cask publishing with formula publishing and adds Homebrew install/test stanzas for the released binary.

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[gemini-code-assist]

Code Review

This pull request transitions the Homebrew distribution from a Cask to a Formula by updating the .goreleaser.yaml configuration and the installation instructions in README.md. The reviewer suggested enhancing the Homebrew test block to verify that the command output contains expected content, ensuring the binary functions correctly rather than just checking the exit status.

[gemini-code-assist]

The Homebrew test block currently only verifies that the command exits successfully. It is a best practice to also verify that the output contains expected content (e.g., the application name) to ensure the binary is functioning correctly and is the intended tool.

    test: |
      assert_match "tapd", shell_output("#{bin}/tapd --help")