Changes for bundler 4

Copy across the .ruby-version file so bundler knows what version to use. Also --path is no longer supported so remove it.

Author: zetter-rpf

Dockerfile

@@ -22,9 +22,10 @@ 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 /app/
+COPY Gemfile Gemfile.lock .ruby-version /app/
+RUN bundle config set bin '/usr/local/bundle/bin'
 RUN bundle install --jobs 4 \
-  && bundle binstubs --all --path /usr/local/bundle/bin \
+  && bundle binstubs --all \
   && bundle binstubs bundler --force
 
 # Dev container image