An attempt at docker

.dockerignore

@@ -0,0 +1,2 @@
+/public/assets
+/app/assets/builds

Dockerfile

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+# syntax = docker/dockerfile:1
+
+# Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
+ARG RUBY_VERSION=3.2.2
+FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
+
+# Rails app lives here
+WORKDIR /rails
+
+# Set production environment
+ENV RAILS_ENV="production" \
+    BUNDLE_DEPLOYMENT="1" \
+    BUNDLE_PATH="/usr/local/bundle"
+
+
+# Throw-away build stage to reduce size of final image
+FROM base as build
+
+# Install packages needed to build gems
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y \
+    build-essential git libpq-dev libvips pkg-config curl sassc libsass-dev libjemalloc2 zlib1g-dev openssl libssl-dev
+
+# Install application gems
+COPY Gemfile Gemfile.lock ./
+RUN bundle install && \
+    rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
+    bundle exec bootsnap precompile --gemfile
+
+
+# Copy application code
+COPY . .
+
+# Precompile bootsnap code for faster boot times
+RUN bundle exec bootsnap precompile app/ lib/
+
+# Work around a bug in SASSC https://github.com/sass/sassc-ruby/issues/146
+ENV BUNDLE_BUILD__SASSC=--disable-march-tune-native
+
+RUN RAILS_ENV=production BUILD_STAGE=docker ./bin/rails tailwindcss:build
+RUN RAILS_ENV=production BUILD_STAGE=docker ./bin/rails assets:precompile
+
+
+# Final stage for app image
+FROM base
+
+# Install packages needed for deployment
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y libvips postgresql-client curl && \
+    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+
+# Copy built artifacts: gems, application
+COPY --from=build /usr/local/bundle /usr/local/bundle
+COPY --from=build /rails /rails
+
+# Run and own only the runtime files as a non-root user for security
+RUN useradd rails --home /rails --shell /bin/bash && \
+    chown -R rails:rails db log storage tmp
+USER rails:rails
+
+# Entrypoint prepares the database.
+ENTRYPOINT ["/rails/bin/docker-entrypoint"]
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 3000

Gemfile.lock

@@ -161,6 +161,8 @@ GEM
     net-smtp (0.4.0)
       net-protocol
     nio4r (2.5.9)
+    nokogiri (1.15.4-aarch64-linux)
+      racc (~> 1.4)
     nokogiri (1.15.4-arm64-darwin)
       racc (~> 1.4)
     pg (1.5.4)
@@ -225,7 +227,7 @@ GEM
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 3.0)
       websocket (~> 1.0)
-    sidekiq (7.1.4)
+    sidekiq (7.1.5)
       concurrent-ruby (< 2)
       connection_pool (>= 2.3.0)
       rack (>= 2.2.4)
@@ -240,6 +242,8 @@ GEM
     stimulus-rails (1.2.2)
       railties (>= 6.0.0)
     stringio (3.0.8)
+    tailwindcss-rails (2.0.30-aarch64-linux)
+      railties (>= 6.0.0)
     tailwindcss-rails (2.0.30-arm64-darwin)
       railties (>= 6.0.0)
     thor (1.2.2)
@@ -269,6 +273,7 @@ GEM
     zeitwerk (2.6.12)
 
 PLATFORMS
+  aarch64-linux
   arm64-darwin-22
 
 DEPENDENCIES

app/assets/stylesheets/application.css

@@ -21,4 +21,4 @@
 
 .lecture-cancelled {
     background: repeating-linear-gradient(45deg, rgb(254 226 226/var(--tw-bg-opacity)), rgb(254 226 226/var(--tw-bg-opacity)) 10px, white 10px, white 20px);
-}
+}

bin/docker-entrypoint

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+#!/bin/sh
+
+if [ $# -eq 0 ]; then
+  # Create new or migrate existing database
+  ./bin/rails db:prepare
+
+  # Start the server by default
+  exec bin/rails server
+else
+  # Allow other commands, like console or runner, to be called
+  exec bin/rails "$@"
+fi