Add heroku.yml

.dockerignore

@@ -32,7 +32,7 @@
 !/tmp/storage/.keep
 
 # Ignore assets.
-/node_modules/
+/node_modules/*
 /app/assets/builds/*
 !/app/assets/builds/.keep
 /public/assets

Dockerfile

@@ -0,0 +1,80 @@
+# syntax = docker/dockerfile:1
+
+# This Dockerfile is designed for production, not development. Use with Kamal or build'n'run by hand:
+# docker build -t my-app .
+# docker run -d -p 80:80 -p 443:443 --name my-app -e RAILS_MASTER_KEY=<value from config/master.key> my-app
+
+# For a containerized dev environment, see Dev Containers: https://guides.rubyonrails.org/getting_started_with_devcontainer.html
+
+# Make sure RUBY_VERSION matches the Ruby version in .ruby-version
+ARG RUBY_VERSION=3.3.1
+FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
+
+# Rails app lives here
+WORKDIR /rails
+
+# Install base packages
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y curl libjemalloc2 libvips postgresql-client && \
+    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+
+# Set production environment
+ENV RAILS_ENV="production" \
+    BUNDLE_DEPLOYMENT="1" \
+    BUNDLE_PATH="/usr/local/bundle" \
+    BUNDLE_WITHOUT="development"
+
+# Throw-away build stage to reduce size of final image
+FROM base as build
+
+# Install packages needed to build gems
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y build-essential git libpq-dev pkg-config unzip && \
+    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+
+ENV BUN_INSTALL=/usr/local/bun
+ENV PATH=/usr/local/bun/bin:$PATH
+ARG BUN_VERSION=1.1.8
+RUN curl -fsSL https://bun.sh/install | bash -s -- "bun-v${BUN_VERSION}"
+
+# Install application gems
+COPY Gemfile Gemfile.lock ./
+RUN bundle install && \
+    rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
+    bundle exec bootsnap precompile --gemfile
+
+# Install node modules
+COPY package.json bun.lockb ./
+RUN bun install --frozen-lockfile
+
+# Copy application code
+COPY . .
+
+# Precompile bootsnap code for faster boot times
+RUN bundle exec bootsnap precompile app/ lib/
+
+# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
+RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
+
+RUN rm -rf node_modules tmp/cache log/* log/*.log tmp/* tmp/pids/* tmp/sockets/* tmp/sessions/* tmp/cache/*
+
+
+# Final stage for app image
+FROM base
+
+# Copy built artifacts: gems, application
+COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
+COPY --from=build /rails /rails
+
+# Run and own only the runtime files as a non-root user for security
+RUN groupadd --system --gid 1000 rails && \
+    useradd rails --uid 1000 --gid 1000 --create-home --shell /bin/bash && \
+    chown -R rails:rails db log storage tmp
+USER 1000:1000
+
+# Entrypoint prepares the database.
+ENTRYPOINT ["/rails/bin/docker-entrypoint"]
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 3000
+CMD ["./bin/rails", "server"]

bin/docker-entrypoint

@@ -1,5 +1,10 @@
 #!/bin/bash -e
 
+# Enable jemalloc for reduced memory usage and latency.
+if [ -z "${LD_PRELOAD+x}" ] && [ -f /usr/lib/*/libjemalloc.so.2 ]; then
+  export LD_PRELOAD="$(echo /usr/lib/*/libjemalloc.so.2)"
+fi
+
 # If running the rails server then create or migrate existing database
 if [ "${1}" == "./bin/rails" ] && [ "${2}" == "server" ]; then
   ./bin/rails db:prepare