ci(renovate): track Chef Workstation stable versions

Author: dafyddj

.github/renovate.json5

@@ -4,10 +4,12 @@
     'github-actions',
     'gitlabci',
     'pre-commit',
+    'custom.regex',
   ],
   extends: [
     'github>saltstack-formulas/.github',
     'github>saltstack-formulas/.github:automerge-for-formulas',
+    'github>saltstack-formulas/.github:update-chef-workstation',
     'github>saltstack-formulas/.github:update-github-actions',
     'github>saltstack-formulas/.github:update-gitlab-ci',
     'github>saltstack-formulas/.github:update-pre-commit',

Gemfile

@@ -1,5 +1,9 @@
 # frozen_string_literal: true
 
+# This is a placeholder version to remind us to update the Gemfile
+# when a new stable Chef Workstation is released
+# renovate: chef-workstation 25.9.1094
+
 source ENV.fetch('PROXY_RUBYGEMSORG', 'https://rubygems.org')
 
 # Install the `inspec` gem using `git` because versions after `4.22.22`