fixing ruby version

Author: jayair

.github/workflows/ebook.yml

@@ -9,6 +9,9 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: '3.0.7'
     - name: Get git tag
       id: get_ref
       run: echo ::set-output name=REF::${GITHUB_REF/refs\/tags\//}

etc/ebook/build-pdf.rb

@@ -82,9 +82,7 @@ def build_chapter chapter_data
 
     chapter.force_encoding(::Encoding::UTF_8)
 
-    # Update for Ruby 3.2
-    # chapter_front_matter = YAML.load_file("../../_chapters/#{chapter_name}.md")
-    chapter_front_matter = YAML::load(File.read("../../_chapters/#{chapter_name}.md"))
+    chapter_front_matter = YAML.load_file("../../_chapters/#{chapter_name}.md")
 
     #################
     # Validations