Add Ruby on Rails CI workflow

[brunto]

This workflow installs Ruby, sets up a PostgreSQL database, and runs tests and linters for a Ruby on Rails application.

[Copilot]

Pull Request Overview

This PR adds a comprehensive GitHub Actions CI workflow for a Ruby on Rails application. The workflow includes database setup, testing, and security/style linting to ensure code quality and security compliance.

• Adds CI workflow with PostgreSQL database service and test execution
• Introduces security auditing tools (bundler-audit, brakeman) as dependencies
• Configures Ruby version specification and disables asset configuration in test dummy app

Reviewed Changes

Copilot reviewed 4 out of 10 changed files in this pull request and generated no comments.

File	Description
.github/workflows/rubyonrails.yml	Main CI workflow with test and lint jobs for Rails application
scripsit.gemspec	Adds bundler-audit and brakeman dependencies for security scanning
.ruby-version	Specifies Ruby 3.4.5 as the project's Ruby version
test/dummy/config/initializers/assets.rb	Comments out asset configuration for test environment

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