Upgrade to Rails 8.

.dockerignore

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+# See https://docs.docker.com/engine/reference/builder/#dockerignore-file for
+# more about ignoring files.
+
+# Ignore bundler configuration.
+/.bundle
+
+# Ignore Docker-related files.
+/.dockerignore
+/Dockerfile*
+
+# Ignore all environment files.
+/.env*
+
+# Ignore git directory and files.
+/.git/
+/.gitattributes
+/.gitignore
+
+# Ignore GitHub files.
+/.github
+
+# Ignore Ruby-related files.
+/.rubocop.yml
+/.ruby-lsp/
+
+# Ignore any asset builds.
+/app/assets/builds/*
+!/app/assets/builds/.keep
+
+# Ignore all default key files.
+/config/master.key
+/config/credentials/*.key
+
+# Ignore all logs and temporary files.
+/log/*
+/tmp/*
+!/log/.keep
+!/tmp/.keep
+
+# Ignore any development and test files.
+/node_modules
+/spec
+/.yarn
+.erb-lint.yml
+.stylelintignore
+.stylelintrc.json
+.yarnrc.yml
+Procfile.dev
+README.md
+babel.config.cjs
+eslint.config.cjs
+package.json
+yarn.lock
+
+# Ignore any pre-compiled assets.
+/public/assets
+
+# Ignore any SQLite databases.
+/storage/*
+!/storage/.keep
+
+# Ignore PID files.
+/tmp/pids/*
+!/tmp/pids/
+!/tmp/pids/.keep
+
+# Ignore storage for uploaded files in development.
+/tmp/storage/*
+!/tmp/storage/
+!/tmp/storage/.keep

.erb-lint.yml

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+---
+glob: "**/*.erb"
+exclude:
+  - "**/vendor/**/*"
+linters:
+  PartialInstanceVariable:
+    enabled: true
+  Rubocop:
+    enabled: true
+    rubocop_config:
+      inherit_from:
+        - .rubocop.yml
+      Layout/InitialIndentation:
+        Enabled: false
+      Layout/TrailingEmptyLines:
+        Enabled: false
+      Style/FrozenStringLiteralComment:
+        Enabled: false

.gitattributes

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+# See https://git-scm.com/docs/gitattributes for more about git
+# attribute files.
+
+# Mark the Bundler lock file as having been generated.
+Gemfile.lock linguist-generated=true
+
+# Customize the difference command for the Rails credentials.
+config/credentials/*.yml.enc diff=rails_credentials
+config/credentials.yml.enc diff=rails_credentials
+
+# Mark the database schema as having been generated.
+db/schema.rb linguist-generated
+
+# Mark any vendored files as having been vendored.
+vendor/* linguist-vendored

.github/dependabot.yml

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+version: 2
+updates:
+- package-ecosystem: bundler
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+- package-ecosystem: github-actions
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10

.github/workflows/ci.yml

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+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  Ruby:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v4
+      - name: Install Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+      - name: Install Node
+        uses: actions/setup-node@v4
+        with:
+          cache: "yarn"
+      - name: Install the Node dependencies
+        run: yarn install
+      - name: Run the Ruby tests
+        env:
+          COVERAGE: true
+          RAILS_ENV: test
+        run: bin/rails db:setup ruby:test
+
+  JavaScript:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v4
+      - name: Install Node
+        uses: actions/setup-node@v4
+        with:
+          cache: "yarn"
+      - name: Install the Node dependencies
+        run: yarn install
+      - name: Run the JavaScript tests
+        run: yarn test:coverage
+
+  Linting:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v4
+      - name: Install Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+      - name: Install Node
+        uses: actions/setup-node@v4
+        with:
+          cache: "yarn"
+      - name: Install the Node dependencies
+        run: yarn install
+      - name: Lint the ERB
+        run: bundle exec erblint .
+      - name: Lint the Ruby
+        run: bin/rubocop --format github --parallel
+      - name: Lint the JavaScript
+        run: yarn lint
+      - name: Lint the CSS
+        run: yarn lint:css
+
+  Docker:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker
+        uses: docker/setup-buildx-action@v3
+      - name: Build the image
+        uses: docker/build-push-action@v6
+        with:
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          push: false
+
+  Vulnerabilities:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v4
+      - name: Install Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+      - name: Scan for vulnerabilities
+        run: bin/brakeman --format github --no-pager
+      - name: Scan for vulnerabilities in JavaScript dependencies
+        run: bin/importmap audit

.gitignore

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+# Ignore all environment files.
+/.env*
+
+# Ignore Yarn files.
+/.yarn
+
+# Ignore any asset builds.
+/app/assets/builds/*
+!/app/assets/builds/.keep
+
+# Ignore master key for decrypting credentials and more.
+/config/master.key
+
+# Ignore all logs and temporary files.
+/log/*
+/tmp/*
+!/log/.keep
+!/tmp/.keep
+
+# Ignore any development dependencies.
+/node_modules
+
+# Ignore any pre-compiled assets.
+/public/assets
+
+# Ignore any SQLite databases.
+/storage/*
+!/storage/.keep
+
+# Ignore PID files.
+/tmp/pids/*
+!/tmp/pids/
+!/tmp/pids/.keep
+
+# Ignore storage for uploaded files in development.
+/tmp/storage/*
+!/tmp/storage/
+!/tmp/storage/.keep

.kamal/hooks/docker-setup.sample

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+#!/usr/bin/env ruby
+
+# A sample docker-setup hook
+#
+# Sets up a Docker network on defined hosts which can then be used by the application’s containers
+
+hosts = ENV["KAMAL_HOSTS"].split(",")
+
+hosts.each do |ip|
+  destination = "root@#{ip}"
+  puts "Creating a Docker network \"kamal\" on #{destination}"
+  `ssh #{destination} docker network create kamal`
+end

.kamal/hooks/post-deploy.sample

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+#!/bin/sh
+
+# A sample post-deploy hook
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+# KAMAL_RUNTIME
+
+echo "$KAMAL_PERFORMER deployed $KAMAL_VERSION to $KAMAL_DESTINATION in $KAMAL_RUNTIME seconds"

.kamal/hooks/post-proxy-reboot.sample

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+#!/bin/sh
+
+echo "Rebooted kamal-proxy on $KAMAL_HOSTS"

.kamal/hooks/pre-build.sample

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+#!/bin/sh
+
+# A sample pre-build hook
+#
+# Checks:
+# 1. We have a clean checkout
+# 2. A remote is configured
+# 3. The branch has been pushed to the remote
+# 4. The version we are deploying matches the remote
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+
+if [ -n "$(git status --porcelain)" ]; then
+  echo "Git checkout is not clean, aborting..." >&2
+  git status --porcelain >&2
+  exit 1
+fi
+
+first_remote=$(git remote)
+
+if [ -z "$first_remote" ]; then
+  echo "No git remote set, aborting..." >&2
+  exit 1
+fi
+
+current_branch=$(git branch --show-current)
+
+if [ -z "$current_branch" ]; then
+  echo "Not on a git branch, aborting..." >&2
+  exit 1
+fi
+
+remote_head=$(git ls-remote $first_remote --tags $current_branch | cut -f1)
+
+if [ -z "$remote_head" ]; then
+  echo "Branch not pushed to remote, aborting..." >&2
+  exit 1
+fi
+
+if [ "$KAMAL_VERSION" != "$remote_head" ]; then
+  echo "Version ($KAMAL_VERSION) does not match remote HEAD ($remote_head), aborting..." >&2
+  exit 1
+fi
+
+exit 0

.kamal/hooks/pre-connect.sample

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+#!/usr/bin/env ruby
+
+# A sample pre-connect check
+#
+# Warms DNS before connecting to hosts in parallel
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+# KAMAL_RUNTIME
+
+hosts = ENV["KAMAL_HOSTS"].split(",")
+results = nil
+max = 3
+
+elapsed = Benchmark.realtime do
+  results = hosts.map do |host|
+    Thread.new do
+      tries = 1
+
+      begin
+        Socket.getaddrinfo(host, 0, Socket::AF_UNSPEC, Socket::SOCK_STREAM, nil, Socket::AI_CANONNAME)
+      rescue SocketError
+        if tries < max
+          puts "Retrying DNS warmup: #{host}"
+          tries += 1
+          sleep rand
+          retry
+        else
+          puts "DNS warmup failed: #{host}"
+          host
+        end
+      end
+
+      tries
+    end
+  end.map(&:value)
+end
+
+retries = results.sum - hosts.size
+nopes = results.count { |r| r == max }
+
+puts "Prewarmed %d DNS lookups in %.2f sec: %d retries, %d failures" % [ hosts.size, elapsed, retries, nopes ]