add pa11y task and CI integration

.github/workflows/scan.yml

@@ -0,0 +1,31 @@
+name: Scan for accessibility
+
+on:
+  pull_request:
+    branches: [latest, develop, release-*]
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  scan:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3
+
+      - name: Setup ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.3'
+          bundler-cache: true
+
+      - name: Make Html
+        run: |
+          rake build
+
+      - name: Scan for accessibility
+        run: |
+          rake scan

.pa11yci

@@ -0,0 +1,7 @@
+{
+  "defaults": {
+    "chromeLaunchConfig": {
+      "args": ["--no-sandbox"]
+    }
+  }
+}

Rakefile

@@ -20,6 +20,11 @@ task :spellcheck do
   exec "#{run_cmd} make spellcheck"
 end
 
+desc "scan for accessibility"
+task :scan do
+  exec "#{run_cmd} pa11y-ci /doc/build/html/**/*.html"
+end
+
 desc "Open built documentation in browser"
 task :open do
   if windows?