add mail interceptor

[microstudi]

No description provided.

[Copilot]

Pull request overview

This PR adds an email interceptor functionality to prevent emails from being sent to unintended recipients in non-production environments. It allows administrators to configure a list of allowed email addresses or domains, and any outgoing emails will be filtered to only include recipients that match this allowed list.

Key Changes:

• Implemented a mail interceptor that filters outgoing emails based on an allowed recipients list configured via environment variable
• Added support for both exact email matching and domain-based pattern matching (e.g., @pokecode.net)
• Included comprehensive test coverage for various filtering scenarios including case-insensitive matching

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
app/mailers/decidim/pokecode/mail_interceptor.rb	Core implementation of the mail interceptor with filtering logic for to/cc/bcc recipients
lib/decidim/pokecode/configuration.rb	Adds configuration accessor for ALLOWED_RECIPIENTS environment variable and helper method to parse the list
lib/decidim/pokecode/engine.rb	Registers the mail interceptor during Rails initialization when allowed recipients are configured
spec/lib/mail_interceptor_spec.rb	Comprehensive test suite covering domain matching, exact email matching, case sensitivity, and mixed recipient scenarios
README.md	Documents the new ALLOWED_RECIPIENTS environment variable with usage examples

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.