fixed docker image issue stating "The last version of bundler (>= 0) to support your Ruby & RubyGems was 2.4.22. Try installing it with `gem install bundler -v 2.4.22"

Author: milesstanfield

Dockerfile

@@ -9,7 +9,7 @@ RUN adduser -u 9000 -g 9000 -D app
 COPY Gemfile Gemfile.lock /usr/src/app/
 
 RUN apk add --update build-base && \
-    gem install bundler && \
+    gem install bundler -v 2.4.22 && \
     bundle install --quiet -j 4 --without=test && \
     chown -R app:app /usr/local/bundle && \
     rm -fr ~/.gem ~/.bundle ~/.wh..gem && \