user and group defined in alias and change permits for bundle (#15)

* user and group defined in alias and change permits for bundle

* configuring it as ENV it's not user specific

Dockerfile

@@ -19,8 +19,10 @@ RUN apt-get update -qq && apt-get install -y nodejs && npm install -g yarn
 WORKDIR /rails
 
 # Ensure gems are installed on a persistent volume and available as bins
+# Make the folder world writable to let the default user install the gems
+RUN mkdir /bundle && chmod -R ugo+rwt /bundle
 VOLUME /bundle
-RUN bundle config set --global path '/bundle'
+ENV BUNDLE_PATH='/bundle'
 ENV PATH="/bundle/ruby/$RUBY_VERSION/bin:${PATH}"
 
 # Install Rails

README.md

@@ -6,7 +6,7 @@ Install [Docker](https://www.docker.com/products/docker-desktop/) (and [WSL](htt
 
 ```bash
 docker volume create ruby-bundle-cache
-alias docked='docker run --rm -it -v ${PWD}:/rails -v ruby-bundle-cache:/bundle -p 3000:3000 ghcr.io/rails/cli'
+alias docked='docker run --rm -it -v ${PWD}:/rails -u $(id -u):$(id -g) -v ruby-bundle-cache:/bundle -p 3000:3000 ghcr.io/rails/cli'
 ```
 
 Then create your Rails app: