Include more Ruby metadata files

- include `.ruby-version` and in the project root (and unignore in
  `.gitignore`) to improve editor support which expects these files
- use the `.ruby-version` in `docs/Gemfile` to use a consistent Ruby
  version here
- remove hardcoded Ruby versions from `workflows/docs` in favour of
  using the `.ruby-version` file instead
- use more consistent configuration in `workflows/docs` to match
  `workflows/tests`

.github/workflows/docs.yml

@@ -9,6 +9,13 @@ on:
 permissions:
   contents: read
 
+env:
+  HOMEBREW_DEVELOPER: 1
+  HOMEBREW_NO_AUTO_UPDATE: 1
+  HOMEBREW_NO_ENV_HINTS: 1
+  HOMEBREW_BOOTSNAP: 1
+  HOMEBREW_NO_INSTALL_CLEANUP: 1
+
 jobs:
   linting:
     if: github.repository == 'Homebrew/brew'
@@ -45,7 +52,6 @@ jobs:
       - name: Install Ruby
         uses: ruby/setup-ruby@943103cae7d3f1bb1e4951d5fcc7928b40e4b742 # v1.177.1
         with:
-          ruby-version: "3.1"
           bundler-cache: true
           working-directory: ${{ steps.set-up-homebrew.outputs.repository-path }}/docs
 
@@ -85,8 +91,8 @@ jobs:
       - name: Install Ruby
         uses: ruby/setup-ruby@943103cae7d3f1bb1e4951d5fcc7928b40e4b742 # v1.177.1
         with:
-          ruby-version: "3.1"
           bundler-cache: true
+          working-directory: rubydoc
 
       - name: Process rubydoc comments
         working-directory: ${{ steps.set-up-homebrew.outputs.repository-path }}/Library/Homebrew

.gitignore

@@ -173,9 +173,10 @@
 !/.editorconfig
 !/.gitignore
 !/.irb_config
-!/.yardopts
-!/.vale.ini
+!/.ruby-version
 !/.shellcheckrc
+!/.vale.ini
+!/.yardopts
 !/CHANGELOG.md
 !/CONTRIBUTING.md
 !/Dockerfile

.ruby-version

@@ -0,0 +1 @@
+3.3.1

docs/.ruby-version

@@ -0,0 +1 @@
+3.3.1

docs/Gemfile

@@ -1,5 +1,7 @@
 source "https://rubygems.org"
 
+ruby file: ".ruby-version"
+
 gem "github-pages", group: :jekyll_plugins
 
 group :test do