Squashing changes associated with pg

Dockerfile

@@ -1,10 +1,10 @@
 FROM ruby:2.6.5
 RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
 RUN mkdir /myapp
+RUN chgrp -R 0 /myapp \
+  && chmod -R g+rwX /myapp
 WORKDIR /myapp
+RUN bundle install
 ADD Gemfile /myapp/Gemfile
 ADD Gemfile.lock /myapp/Gemfile.lock
-RUN bundle install
-ADD . /myapp
-RUN chgrp -R 0 /myapp \
-  && chmod -R g+rwX /myapp
+ADD . /myapp