update the dockerfile to actually work

Dockerfile

@@ -10,21 +10,42 @@ FROM ruby:3.2.1
 # Properties/labels for the image.
 LABEL maintainer="Notebook.ai Contributors"
 
+# Development ENV by default, but overridable with RAILS_ENV
+ARG RAILS_ENV=development
+ENV RAILS_ENV=${RAILS_ENV}
+
 # Copy the current folder into the notebookai user's home directory.
 COPY . /home/notebookai
 
 # Set the notebookai user's home directory as the working directory.
 WORKDIR /home/notebookai
 
-# Prep the image for runtime, this should all be done in one command
-# to minimize image layers.
-# See: https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#minimize-the-number-of-layers
+# Create the notebookai user and group
 RUN groupadd --system --gid 1000 notebookai && \
-    useradd --system --home-dir /home/notebookai --gid notebookai --uid 1000 --shell /bin/bash notebookai && \
+    useradd --system --home-dir /home/notebookai --gid notebookai --uid 1000 --shell /bin/bash notebookai
+
+# Install system dependencies
+RUN curl -sL https://deb.nodesource.com/setup_16.x | bash - && \
     apt-get update -qq && \
-    apt-get install -y build-essential libpq-dev nodejs imagemagick libmagickwand-dev && \
-    rm --recursive --force /var/lib/apt/lists/* && \
-    bundle install && \
+    apt-get install -y build-essential libpq-dev nodejs imagemagick libmagickwand-dev curl && \
+    rm --recursive --force /var/lib/apt/lists/*
+
+# Install yarn
+RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
+    echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
+    apt-get update && \
+    apt-get install -y yarn
+
+# Install app dependencies, compile assets, and set up the database
+RUN bundle install && \
+    yarn install && \
+    if [ "$RAILS_ENV" = "development" ] ; then \
+        echo "Starting webpack-dev-server..." && \
+        bin/webpack-dev-server & \
+    else \
+        echo "Compiling webpack assets..." && \
+        rails webpacker:compile ; \
+    fi && \
     rails db:setup
 
 # This image should expose the port 3000.