Move CI to Buildkite

Author: joshuay03

.buildkite/pipeline.yml

@@ -0,0 +1,18 @@
+steps:
+  - label: ":ruby: Ruby {{matrix.ruby}}"
+    image: "ruby:{{matrix.ruby}}"
+    commands:
+      - bundle install
+      - bundle exec rake
+    matrix:
+      setup:
+        ruby:
+          - "3.3"
+          - "3.4"
+
+  - label: ":ruby: Ruby head"
+    image: "rubylang/ruby:master-dev"
+    commands:
+      - apt-get update && apt-get install -y libyaml-dev
+      - bundle install
+      - bundle exec rake

.github/workflows/docs.yml

@@ -0,0 +1,29 @@
+name: YARD Docs
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: head
+          bundler-cache: true
+
+      - name: Generate YARD docs
+        run: bundle exec yard doc --no-private
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: doc