Update documentation links to use gh-pages, and add action to publish gh-pages from Yard docs.

Author: gkellogg

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
         ruby:
           - 2.6
           - 2.7
-          - 3.0
+          - "3.0"
           - 3.1
           - ruby-head
           - jruby

.github/workflows/generate-docs.yml

@@ -0,0 +1,27 @@
+name: Build & deploy documentation
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Update gh-pages with docs
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.1"
+      - name: Install required gem dependencies
+        run: gem install yard --no-document
+      - name: Build YARD Ruby Documentation
+        run: yardoc
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./doc/yard
+          publish_branch: gh-pages

README.md

@@ -60,7 +60,7 @@ puts data.to_json_c14n
 ```
 
 ## Documentation
-Full documentation available on [RubyDoc](http://rubydoc.info/gems/json-canonicalization/file/README.md)
+Full documentation available on [RubyDoc](https://dryruby.github.io/json-canonicalization/file/README.md)
 
 ### Principal Classes
 * {JSON::Canonicalization}

json-canonicalization.gemspec

@@ -10,6 +10,12 @@ Gem::Specification.new do |gem|
   gem.license               = 'Unlicense'
   gem.summary               = "JSON Canonicalization for Ruby."
   gem.description           = "JSON::Canonicalization generates canonical JSON output from Ruby objects."
+  gem.metadata           = {
+    "documentation_uri" => "https://dryruby.github.io/json-canonicalization",
+    "bug_tracker_uri"   => "https://github.com/dryruby/json-canonicalization/issues",
+    "homepage_uri"      => "https://github.com/dryruby/json-canonicalization",
+    "source_code_uri"   => "https://github.com/dryruby/json-canonicalization",
+  }
 
   gem.authors               = ['Gregg Kellogg']