Cleanup

.dockerignore

@@ -1,39 +1,4 @@
-# See https://docs.docker.com/engine/reference/builder/#dockerignore-file for more about ignoring files.
-
-# Ignore git directory.
-/.git/
-
-# Ignore bundler config.
-/.bundle
-
-# Ignore all default key files.
-/config/master.key
-/config/credentials/*.key
-
-# Ignore all environment files.
-/.env*
-!/.env.example
-
-# Ignore all logfiles and tempfiles.
-/log/*
-/tmp/*
-!/log/.keep
-!/tmp/.keep
-
-# Ignore pidfiles, but keep the directory.
-/tmp/pids/*
-!/tmp/pids/
-!/tmp/pids/.keep
-
-# Ignore storage (uploaded files in development and any SQLite databases).
-/storage/*
-!/storage/.keep
-/tmp/storage/*
-!/tmp/storage/
-!/tmp/storage/.keep
-
-# Ignore assets.
-/node_modules/
-/app/assets/builds/*
-!/app/assets/builds/.keep
-/public/assets
+*
+!/public/
+!/config.ru
+!/Gemfile*

Dockerfile

@@ -1,18 +1,14 @@
-# syntax = docker/dockerfile:1
-
-FROM ruby:3.2-alpine
-
+FROM ruby:3.2-alpine as base
 WORKDIR /app
 
-RUN apk add build-base
+FROM base as build
+COPY Gemfile Gemfile.lock .
+RUN set -eux; \
+    apk add --no-cache build-base; \
+    bundle install;
 
-# Install application gems
-COPY Gemfile Gemfile.lock ./
-RUN bundle install
-
-# Copy application code
+FROM base as app
+COPY --from=build /usr/local/bundle /usr/local/bundle
 COPY . .
-
-# Start the server by default, this can be overwritten at runtime
 EXPOSE 9292
 CMD ["puma"]