Use unique email as default for admin user when not supplied in the docker ENV

[michaelongso]

The enhancement

When ADMIN_EMAIL env is not set with the docker run command, the const octopus@example.local is used as a placeholder.

Solution

A unique identifier will be used as the placeholder email for the admin user, ensuring each Octopus instance can be distinctly identified.

[octoreleasebot]

Release Note: Use unique email as default for admin user when not supplied in the docker ENV

[team-builds-bot]

🎉 The fix for this issue has been released in:

Release stream	Release
2026.1	2026.1.11304
2026.2	2026.2.3995