Use .tool-versions rather than .ruby-version

Bundler and most version managers support .tool-versions now so it's one less place to keep up to date

Author: zetter-rpf

.ruby-version

@@ -22,7 +22,7 @@ RUN apt-get update \
   build-essential libpq-dev libxml2-dev libxslt1-dev git libyaml-dev \
   firefox-esr \
   && rm -rf /var/lib/apt/lists/* /var/lib/apt/archives/*.deb
-COPY Gemfile Gemfile.lock .ruby-version /app/
+COPY Gemfile Gemfile.lock .tool-versions /app/
 RUN bundle config set bin '/usr/local/bundle/bin'
 RUN bundle install --jobs 4 \
   && bundle binstubs --all \

Dockerfile

@@ -3,7 +3,7 @@
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby file: '.ruby-version'
+ruby file: '.tool-versions'
 
 gem 'administrate', '~> 0.20.1'
 gem 'administrate-field-active_storage'