Document the most useful use of mail stub.

[zagy]

Rather brief documentation. Not sure if it satisfies expected quality.

@flyingcircusio/release-managers

Release process

Impact:

Changelog:

PR release workflow (internal)

• [ ] PR has internal ticket
• [ ] internal issue ID (PL-…) part of branch name
• [ ] internal issue ID mentioned in PR description text
• [ ] ticket is on Platform agile board
• [ ] ticket state set to Pull request ready
• [ ] if ticket is more urgent than within the next few days, directly contact a member of the Platform team

Design notes

• [ ] Provide a feature toggle if the change might need to be adjusted/reverted quickly depending on context. Consider whether the default should be on or off. Example: rate limiting.
• [ ] All customer-facing features and (NixOS) options need to be discoverable from documentation. Add or update relevant documentation such that hosted and guided customers can understand it as well.

Security implications

• [ ] Security requirements defined? (WHERE)
• [ ] Security requirements tested? (EVIDENCE)