Dockerfile in qrcode_pix_ruby-0.3.4 vs Dockerfile in qrcode_pix_ruby-0.4.0

@@ -1,8 +1,6 @@
 FROM ruby:3.0.0-alpine
 RUN apk update && apk add git
-RUN mkdir -p /app/
-WORKDIR /app/
-VOLUME /app/
-COPY . /app/
+WORKDIR /app
+COPY . .
 RUN bundle install
 CMD bundle exec rake