feat: add audit for wayback machine URLs

Library/Homebrew/formula_auditor.rb

@@ -622,6 +622,26 @@ def audit_eol
  problem "Product is EOL since #{metadata["eol"]}, #{see_url}" if Date.parse(metadata["eol"]) <= Date.today
  end
 
+ def audit_wayback_url
+ return unless @core_tap
+ return if formula.deprecated? || formula.disabled?
+
+ regex = %r{^https?://web\.archive\.org}
+ if regex.match?(formula.stable.url)
+ problem "Formula with a Wayback Machine `url` should be deprecated with `:repo_removed`"
+ end
+
+ if regex.match?(formula.homepage)
+ problem "Formula with a Wayback Machine `homepage` should find an alternative `homepage`"
+ end
+
+ return unless formula.head
+
+ return unless regex.match?(formula.head.url)
+
+ problem "Formula with a Wayback `head` should not have a `head` definition"
+ end
+
  def audit_github_repository_archived
  return if formula.deprecated? || formula.disabled?