chore: fixes, several improvements and refactorings (#2)

* chore: fixes

* chore: rubocop fixes, linting, etc.

* chore: switching to use `brew style` only

* chore: use `brew style` for linting, skip example formulae in ci.yml

* chore(lint): fixes, additions and tweaks

Formula/e/example-tool.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+# Homebrew formula for ExampleTool - a demonstration tool for this tap
+class ExampleTool < Formula
+  desc "Imaginery tool to demonstrate the tap functionality"
+  homepage "https://github.com/ivuorinen/example-tool"
+  url "https://github.com/ivuorinen/example-tool/refs/tags/v1.0.0.tar.gz"
+  sha256 "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+  license "MIT"
+
+  depends_on "go" => :build
+
+  def install
+    system "go", "build", *std_go_args(ldflags: "-s -w")
+  end
+
+  test do
+    assert_match "example-tool version 1.0.0", shell_output("#{bin}/example-tool --version")
+  end
+end