use Ruby 2.6, which newest nokogiri needs

SethTisue · SethTisue · commit ba76736813af · 2022-03-01T11:07:59.000-08:00
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.5.8'
+          ruby-version: '2.6.9'
           bundler-cache: true
       - name: Build documents
         run: |
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.5
+FROM ruby:2.6
 
 RUN gem install bundler jekyll
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-FROM ruby:2.5`
	`1`	`+FROM ruby:2.6`
`2`	`2`
`3`	`3`	`RUN gem install bundler jekyll`
`4`	`4`