Task: build a webapp API for converting zip files into a single text in Ruby using Rails.

API specification:

openapi: 3.0.3
info:
  title: ZipToTxt
  description: A simple webapp API for converting zip files into a single text file.
  version: 1.0.11
paths:
  /convert:
    post:
      summary: Convert a zip file to a text file
      description: Convert a zip file into a single text file, concatenating the contents of all text files in the zip.
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                file:
                  type: string
                  format: binary
      responses:
        '200':
          description: Conversion successful
          content:
            text/plain:
              schema:
                type: string
        '400':
          description: Invalid input


Scenario instructions:
You should implement a service that takes a zip file as input and converts it into a single text file.
The text file should contain the contents of all text files in the zip file.
The service should be able to handle multiple text files in the zip file.

Environment instructions:

You need to create the Ruby on Rails project from scratch, after the command `rails new . --api` was run.

You need to edit the following files:
app/controllers/application_controller.rb
app/models/application_record.rb
config/application.rb
config/environments/development.rb
config/routes.rb


Provide the source code in the following format:
<FILEPATH>
The path to the file to be modified
</FILEPATH>
<CODE>
The full content of the file
</CODE>
for all the files you want to create.

Example:
<FILEPATH>
path/to/file.py
</FILEPATH>
<CODE>
def hello_world():
    pass
</CODE>



Use only SQLite as a database. Do not use MySQL, Redis, or any other storage.
Configure SQLite to use database file `db.sqlite3` in config/database.yml
Do NOT provide Gemfile or Gemfile.lock file. Make sure to include the right frameworks in config/application.rb - e.g. require "active_storage/engine"
Do NOT use sprockets or other asset pipeline. Do NOT use config.assets in config/environments/development.rb.
The command `bin/rails server --binding 0.0.0.0 --port 5000` will start the app.


Allowed packages:

source "https://rubygems.org"

# Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
gem "rails", "~> 8.0.1"
# Use sqlite3 as the database for Active Record
gem "sqlite3", ">= 2.1"
# Use the Puma web server [https://github.com/puma/puma]
gem "puma", ">= 5.0"
# Build JSON APIs with ease [https://github.com/rails/jbuilder]
# gem "jbuilder"

# Use Active Model has_secure_password [https://guides.rubyonrails.org/active_model_basics.html#securepassword]
gem "bcrypt", "~> 3.1.7"

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem "tzinfo-data", platforms: %i[ windows jruby ]

# Use the database-backed adapters for Rails.cache, Active Job, and Action Cable
gem "solid_cache"
gem "solid_queue"
gem "solid_cable"

# Reduces boot times through caching; required in config/boot.rb
gem "bootsnap", require: false

# Deploy this application anywhere as a Docker container [https://kamal-deploy.org]
gem "kamal", require: false

# Add HTTP asset caching/compression and X-Sendfile acceleration to Puma [https://github.com/basecamp/thruster/]
gem "thruster", require: false

gem "image_processing", "~> 1.2"

# Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin Ajax possible
gem "rack-cors"

gem 'activestorage', '~> 8.0.1'

group :development, :test do
  # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
  gem "debug", platforms: %i[ mri windows ], require: "debug/prelude"

  # Static analysis for security vulnerabilities [https://brakemanscanner.org/]
  gem "brakeman", require: false

  # Omakase Ruby styling [https://github.com/rails/rubocop-rails-omakase/]
  gem "rubocop-rails-omakase", require: false
end